ztest: math: reference cmocka trig_tables.h instead of copying it

The ztest trigonometry suite had a local copy of
test/cmocka/include/trig_tables.h. This was a mistake: when the legacy
CMock tests are eventually removed, the original header will disappear
losing git history.

Fix this by:
 - Deleting the duplicate trig_tables.h from the ztest directory
 - Adding test/cmocka/include to the CMakeLists include path so the
   ztest suite references the single source-of-truth header directly
 - Moving tolerance constants that were defined in the local copy into
   trig_test.c, where they are actually used

With this change, any future rename or move of the CMock header will be
handled in one place and the ztest suite will follow automatically.

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

Author: tmleman

test/ztest/unit/math/basic/trigonometry/CMakeLists.txt

@@ -8,6 +8,7 @@ set(SOF_ROOT "${PROJECT_SOURCE_DIR}/../../../../../..")
 target_include_directories(app PRIVATE
 	${SOF_ROOT}/zephyr/include
 	${SOF_ROOT}/src/include
+	${SOF_ROOT}/test/cmocka/include
 )
 
 # Define SOF-specific configurations for unit testing