x86, efi: Mark disable_runtime as __initdata

disable_runtime is only referenced from __init functions, so mark it
as __initdata.

Reported-by: Yinghai Lu <yinghai@kernel.org>
Reviewed-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Link: http://lkml.kernel.org/r/1361545427-26393-1-git-send-email-matt@console-pimps.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/platform/efi/efi.c

@@ -85,7 +85,7 @@ int efi_enabled(int facility)
 }
 EXPORT_SYMBOL(efi_enabled);
 
-static bool disable_runtime = false;
+static bool __initdata disable_runtime = false;
 static int __init setup_noefi(char *arg)
 {
 	disable_runtime = true;