cmocka: Remove base-e logarithm tests

This patch removes the base-e logarithm test that has been successfully
converted from cmocka to ztest.

The ztest equivalent is in test/ztest/unit/math/advanced/functions/
test_base_e_logarithm_ztest.c and was merged in PR #10764.

Ztest coverage for log_e.c:
- lines: 100% (2/2)
- funcs: 100% (1/1)

Code coverage testing did not reveal any regression.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>

Author: tmleman

test/cmocka/src/math/arithmetic/CMakeLists.txt

@@ -1,11 +1,5 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
-cmocka_test(base_e_logarithm
-	base_e_logarithm.c
-	${PROJECT_SOURCE_DIR}/src/math/log_e.c
-	${PROJECT_SOURCE_DIR}/src/math/base2log.c
-)
-
 cmocka_test(a_law_codec
 	a_law_codec.c
 	${PROJECT_SOURCE_DIR}/src/math/a_law.c