drm/xe: Fix modpost warning on xe_mocs kunit module

$ make W=1 -j100 M=drivers/gpu/drm/xe
MODPOST drivers/gpu/drm/xe/Module.symvers
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/gpu/drm/xe/tests/xe_mocs_test.o

Fix is identical to '1d425066 ("drm/xe: Fix modpost warning on kunit
modules")'.

Fixes: a6a4ea6d ("drm/xe: Add mocs kunit")
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit bb619d71)
Link:  https://patchwork.freedesktop.org/patch/msgid/20240213033548.76219-1-ashutosh.dixit@intel.comSigned-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

drivers/gpu/drm/xe/tests/xe_mocs_test.c

@@ -21,4 +21,5 @@ kunit_test_suite(xe_mocs_test_suite);
 
 MODULE_AUTHOR("Intel Corporation");
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("xe_mocs kunit test");
 MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING);