arm-uboot, ia64, sparc64: Fix up grub_file_open() calls

The verifiers framework changed the grub_file_open() interface, breaking all
non-x86 linux loaders. Add file types to the grub_file_open() calls to make
them build again.

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/loader/sparc64/ieee1275/linux.c

@@ -306,7 +306,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
       goto out;
     }
 
-  file = grub_file_open (argv[0]);
+  file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL);
   if (!file)
     goto out;