espressif/common-hal/frequencyio/FrequencyIn.c: fix heap_caps_malloc() arg order

[dhalbert]

• Fixes Wrong usage of heap_caps_malloc in frequencyio? #10394

The arguments to heap_caps_malloc() were in the wrong order. Thanks @Sola85 for spotting this.

Tested. Jumpered A0 and A1 on a QT Py ESP32-S3:

>>> import pwmio, frequencyio, board
>>> a0 = pwmio.PWMOut(board.A0, frequency=123456)
>>> a0.duty_cycle=32768
>>> a1 = frequencyio.FrequencyIn(board.A1)
>>> a1.value
123450

Note that it also "worked" before this fix, but the size allocation was all wrong.

[tannewt]

Thank you!