selftests/kexec: check kexec_load and kexec_file_load are enabled

Skip the kexec_load and kexec_file_load tests, if they aren't configured
in the kernel. This change adds a new requirement that ikconfig is
configured in the kexec_load test.

Suggested-by: Dave Young <[e-mail]>
Signed-off-by: Mimi Zohar <[e-mail]>
Reviewed-by: Petr Vorel <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/kexec/test_kexec_file_load.sh

···
 # get the kernel config
 get_kconfig
 
+kconfig_enabled "CONFIG_KEXEC_FILE=y" "kexec_file_load is enabled"
+if [ $? -eq 0 ]; then
+	log_skip "kexec_file_load is not enabled"
+fi
+
 # Determine which kernel config options are enabled
 kconfig_enabled "CONFIG_IMA_APPRAISE=y" "IMA enabled"
 ima_appraise=$?

tools/testing/selftests/kexec/test_kexec_load.sh

···
 # kexec requires root privileges
 require_root_privileges
 
+# get the kernel config
+get_kconfig
+
+kconfig_enabled "CONFIG_KEXEC=y" "kexec_load is enabled"
+if [ $? -eq 0 ]; then
+	log_skip "kexec_load is not enabled"
+fi
+
 get_secureboot_mode
 secureboot=$?