efi_loader: size fields in SimpleNetworkProtocol

The size fields in the Simple Network Protocol are all
UINTN in the UEFI spec. So use size_t.

Provide a function description of the receive function.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/efi_api.h b/include/efi_api.h
index 1f349db..a9a6494 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -636,11 +636,11 @@
 	efi_status_t (EFIAPI *get_status)(struct efi_simple_network *this,
 			u32 *int_status, void **txbuf);
 	efi_status_t (EFIAPI *transmit)(struct efi_simple_network *this,
-			ulong header_size, ulong buffer_size, void *buffer,
+			size_t header_size, size_t buffer_size, void *buffer,
 			struct efi_mac_address *src_addr,
 			struct efi_mac_address *dest_addr, u16 *protocol);
 	efi_status_t (EFIAPI *receive)(struct efi_simple_network *this,
-			ulong *header_size, ulong *buffer_size, void *buffer,
+			size_t *header_size, size_t *buffer_size, void *buffer,
 			struct efi_mac_address *src_addr,
 			struct efi_mac_address *dest_addr, u16 *protocol);
 	struct efi_event *wait_for_packet;