kselftest/arm64: Fix check_ksm_options test

The check_ksm_options test reports the error below because the test
plan is not declared correctly:

  # Planned tests != run tests (0 != 4)

Fix the test adding the correct test plan declaration.

Fixes: f981d8fa ("kselftest/arm64: Verify KSM page merge for MTE pages")
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Gabor Kertesz <gabor.kertesz@arm.com>
Cc: Amit Daniel Kachhap <amit.kachhap@arm.com>
Link: https://lore.kernel.org/r/20201026121248.2340-6-vincenzo.frascino@arm.comSigned-off-by: Will Deacon <will@kernel.org>

tools/testing/selftests/arm64/mte/check_ksm_options.c

@@ -140,6 +140,10 @@ int main(int argc, char *argv[])
 	/* Register signal handlers */
 	mte_register_signal(SIGBUS, mte_default_handler);
 	mte_register_signal(SIGSEGV, mte_default_handler);
+
+	/* Set test plan */
+	ksft_set_plan(4);
+
 	/* Enable KSM */
 	mte_ksm_setup();