uboot: Add support for the Shikra platform

[aswinm94]

It introduces U-Boot configuration support for the Shikra machine by
enabling UBOOT_CONFIG and selecting qcom_shikra_defconfig for platform-
specific initialization.

Additionally, the GitHub CI workflow is extended to build U-Boot variants
for shikra alongside the linux-qcom-6.18 kernel, ensuring continuous
integration coverage for the platform.

[github-actions]

Test run workflow

Test jobs for commit 989a2d6

qcom-distro_linux-qcom-6.18
Pass: 232 | Fail: 0 | Total: 259

qcom-distro
Pass: 270 | Fail: 0 | Total: 307

nodistro
Pass: 10 | Fail: 0 | Total: 10

[test-reporting-app]

Test Results

  111 files  +   82    658 suites  +629   7h 48m 37s ⏱️ + 6h 38m 42s
  157 tests +  141    156 ✅ +  148   1 💤 + 1  0 ❌  -  8 
4 247 runs  +3 986  4 183 ✅ +3 934  64 💤 +64  0 ❌  - 12 

Results for commit 989a2d6. ± Comparison against base commit 3c8e2f2.

This pull request removes 5 and adds 146 tests. Note that renamed tests count towards both.

lava ‑ auto-login-action
lava ‑ boot-qdl-retry
lava ‑ fastboot-boot
lava ‑ flash-qdl
lava ‑ minimal-boot

0_AudioRecord_Config01 ‑ AudioRecord_Config01
0_BT_FW_KMD_Service ‑ BT_FW_KMD_Service
0_GStreamer_Video_Encode_h264_480p ‑ GStreamer_Video_Encode_h264_480p
0_Libcamera_cam ‑ Libcamera_cam
0_Weston_Runtime_Preflight ‑ Weston_Runtime_Preflight
0_hotplug ‑ hotplug
10_AudioRecord ‑ AudioRecord
10_Docker_Kernel_Config ‑ Docker_Kernel_Config
10_Kubernetes_Kernel_Config ‑ Kubernetes_Kernel_Config
11_DSP_AudioPD ‑ DSP_AudioPD
…

♻️ This comment has been updated with latest results.

[qcomlnxci]

Test Coral run workflow

Test jobs for commit 989a2d6

• qcomdistro: multimedia image
  Pass: 10 | Fail: 0 | Total: 10
• qcomdistro: multimedia image-prop
  Pass: 54 | Fail: 4 | Total: 58

[Dmitry Baryshkov (lumag)]

Set UBOOT_CONFIG to shikra-evk to align with the
U-Boot configuration added for this platform.

Please fix your editor to wrap commit messages at a sane boundary.

[aswinm94]

Set UBOOT_CONFIG to shikra-evk to align with the
U-Boot configuration added for this platform.

Please fix your editor to wrap commit messages at a sane boundary.

Dmitry Baryshkov (@lumag) , the body of commit msg is wrapped under 75 char per line, could you please let me know what is the expectation on this?
The body lines shouldn't be too short?

[Dmitry Baryshkov (lumag)]

Set UBOOT_CONFIG to shikra-evk to align with the
U-Boot configuration added for this platform.

Please fix your editor to wrap commit messages at a sane boundary.

Dmitry Baryshkov (Dmitry Baryshkov (@lumag)) , the body of commit msg is wrapped under 75 char per line, could you please let me know what is the expectation on this? The body lines shouldn't be too short?

It's wrapped at 48 chars, not 75.

[Koen Kooi (koenkooi)]

Leave out "Yocto build environment", it is both self-evident and wrong, since this is an OE build environment, the "Yocto Project" is something else entirely.

[aswinm94]

Set UBOOT_CONFIG to shikra-evk to align with the
U-Boot configuration added for this platform.

Please fix your editor to wrap commit messages at a sane boundary.

Dmitry Baryshkov (Dmitry Baryshkov (Dmitry Baryshkov (@lumag))) , the body of commit msg is wrapped under 75 char per line, could you please let me know what is the expectation on this? The body lines shouldn't be too short?

It's wrapped at 48 chars, not 75.

Dmitry Baryshkov (@lumag) , changed as per the suggestion.

[aswinm94]

Leave out "Yocto build environment", it is both self-evident and wrong, since this is an OE build environment, the "Yocto Project" is something else entirely.

Koen Kooi (@koenkooi) , changed it