types: Split aligned and packed guids

On ia64 alignment requirements are strict. When we pass a pointer to
UUID it needs to be at least 4-byte aligned or EFI will crash.
On the other hand in device path there is no padding for UUID, so we
need 2 types in one formor another. Make 4-byte aligned and unaligned types

The code is structured in a way to accept unaligned inputs
in most cases and supply 4-byte aligned outputs.

Efiemu case is a bit ugly because there inputs and outputs are
reversed and so we need careful casts to account for this
inversion.

Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/commands/efi/lsefi.c

@@ -96,7 +96,7 @@ grub_cmd_lsefi (grub_command_t cmd __attribute__ ((unused)),
       grub_efi_handle_t handle = handles[i];
       grub_efi_status_t status;
       grub_efi_uintn_t num_protocols;
-      grub_guid_t **protocols;
+      grub_packed_guid_t **protocols;
       grub_efi_device_path_t *dp;
 
       grub_printf ("Handle %p\n", handle);