firmware: fix google/gsmi.c build warning

Modify function parameter type to match expected type. Fixes a
build warning:

drivers/firmware/google/gsmi.c:473: warning: initialization from incompatible pointer type

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Mike Waychison <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/firmware/google/gsmi.c

···
 
 static efi_status_t gsmi_set_variable(efi_char16_t *name,
 				      efi_guid_t *vendor,
-				      unsigned long attr,
+				      u32 attr,
 				      unsigned long data_size,
 				      void *data)
 {