regmap: kunit: add missing MODULE_DESCRIPTION()

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/base/regmap/regmap-kunit.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://msgid.link/r/20240530-md-regmap-kunit-v1-1-976c0f616751@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: jeff-t-johnson

drivers/base/regmap/regmap-kunit.c

@@ -1976,4 +1976,5 @@ static struct kunit_suite regmap_test_suite = {
 };
 kunit_test_suite(regmap_test_suite);
 
+MODULE_DESCRIPTION("Regmap KUnit tests");
 MODULE_LICENSE("GPL v2");