selftests/resctrl: Remove duplicate feature check from CMT test

The test runner run_cmt_test() in resctrl_tests.c checks for CMT
feature and does not run cmt_resctrl_val() if CMT is not supported.
Then cmt_resctrl_val() also check is CMT is supported.

Remove the duplicated feature check for CMT from cmt_resctrl_val().

Signed-off-by: Ilpo Järvinen <[e-mail]>
Tested-by: Shaopeng Tan <[e-mail]>
Reviewed-by: Reinette Chatre <[e-mail]>
Reviewed-by: Shaopeng Tan <[e-mail]>
Cc: <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/resctrl/cmt_test.c

···
 	size_t span;
 	int ret, i;
 
-	if (!validate_resctrl_feature_request(CMT_STR))
-		return -1;
-
 	ret = get_cbm_mask("L3", cbm_mask);
 	if (ret)
 		return ret;