efi_loader: interrupts in simple network protocol

GetStatus() must clear the interrupt status.
Transmit() should set the TX interrupt.
Receive() should clear the RX interrupt.
Initialize() and Start() should clear the interrupt status.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/efi_api.h b/include/efi_api.h
index 4377819..7f7b67f 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -1281,6 +1281,8 @@
 			struct efi_mac_address *dest_addr, u16 *protocol);
 	struct efi_event *wait_for_packet;
 	struct efi_simple_network_mode *mode;
+	/* private fields */
+	u32 int_status;
 };
 
 #define EFI_PXE_BASE_CODE_PROTOCOL_GUID \