kunit: configs: Enable CONFIG_INIT_STACK_ALL_PATTERN in all_tests

Enable CONFIG_INIT_STACK_ALL_PATTERN in all_tests.config. This helps
to detect use of uninitialized local variables.

This option found an uninitialized data bug in the cs_dsp test.

Link: https://lore.kernel.org/r/20250411095904.1593224-1-rf@opensource.cirrus.com
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: rfvirgil

tools/testing/kunit/configs/all_tests.config

@@ -10,6 +10,7 @@ CONFIG_KUNIT_EXAMPLE_TEST=y
 CONFIG_KUNIT_ALL_TESTS=y
 
 CONFIG_FORTIFY_SOURCE=y
+CONFIG_INIT_STACK_ALL_PATTERN=y
 
 CONFIG_IIO=y