chromeos: Use __attribute__ normal form

Change-Id: Idf99c1491386578ac2471ca5cc8a153d2b5225e4
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10044
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/vendorcode/google/chromeos/chromeos.c

@@ -50,7 +50,7 @@ void __attribute__((weak)) save_chromeos_gpios(void)
 	// Can be implemented by a mainboard
 }
 
-int __attribute((weak)) vboot_get_sw_write_protect(void)
+int __attribute__((weak)) vboot_get_sw_write_protect(void)
 {
 	// Can be implemented by a platform / mainboard
 	return 0;