mb/asus/am1i-a: add missing GPIO IO ports

This makes the mainboard able to boot again.

Change-Id: Id96fbfd5c815431dba2f030fca62a5ea16b97393
Signed-off-by: Kevin Cody-Little <kcodyjr@gmail.com>
Reviewed-on: https://review.coreboot.org/c/29994
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/asus/am1i-a/devicetree.cb

@@ -82,7 +82,9 @@ chip northbridge/amd/agesa/family16kb/root_complex
 							irq 0x70 = 12
 						end
 						device pnp 2e.7 on		# GPIO
+							io 0x60 = 0x320
 							io 0x62 = 0x300
+							io 0x64 = 0x321
 						end
 					end	#superio/ite/it8623e
 					chip drivers/pc80/tpm