efi/x86: Move efi=debug option parsing to core

fed6cefe ("x86/efi: Add a "debug" option to the efi= cmdline")
adds the DBG flag, but does so for x86 only. Move this early param
parsing to core code.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Mark Salter <msalter@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

arch/x86/platform/efi/efi.c

@@ -961,8 +961,6 @@ static int __init arch_parse_efi_cmdline(char *str)
 
 	if (parse_option_str(str, "old_map"))
 		set_bit(EFI_OLD_MEMMAP, &efi.flags);
-	if (parse_option_str(str, "debug"))
-		set_bit(EFI_DBG, &efi.flags);
 
 	return 0;
 }

drivers/firmware/efi/efi.c

@@ -63,6 +63,9 @@ static int __init parse_efi_cmdline(char *str)
 		return -EINVAL;
 	}
 
+	if (parse_option_str(str, "debug"))
+		set_bit(EFI_DBG, &efi.flags);
+
 	if (parse_option_str(str, "noruntime"))
 		disable_runtime = true;