ltp_acpi: Skip on Lockdown/Secure Boot

Similarly to other kernel modules tests (block_dev.c,
delete_module0[13].c, finit_module02.c and init_module02.c)
also ltp_acpi.c cannot load modules due Lockdown/Secure Boot.

This fixes failure:

ltp_acpi    0  TINFO  :  module signature enforcement: off
insmod: ERROR: could not insert module ltp_acpi_cmds.ko: Key was rejected by service

Follow-up: ca9460d ("fw_load: Skip on Lockdown/Secure Boot")
Signed-off-by: Petr Vorel <pvorel@suse.cz>

Author: pevik

testcases/kernel/device-drivers/acpi/ltp_acpi.c

@@ -24,6 +24,7 @@
 #include "test.h"
 #include "tso_module.h"
 #include "tso_safe_macros.h"
+#include "tst_security.h"
 
 #include "ltp_acpi.h"
 
@@ -134,6 +135,10 @@ int main(int argc, char *argv[])
 	tst_sig(FORK, DEF_HANDLER, cleanup);
 
 	tst_requires_module_signature_disabled();
+
+	if (tst_lockdown_enabled() > 0 || tst_secureboot_enabled() > 0)
+		tst_brkm(TCONF, NULL, "Cannot load unsigned modules in Lockdown/Secure Boot");
+
 	tst_module_load(NULL, module_name, NULL);
 	module_loaded = 1;