sb/intel/i82801gx: Add common LPC decode code

Generic LPC decode ranges can now be set from the devicetree.

Change-Id: I1065ec770ad3a743286859efa39dca09ccb733a1
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36700
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/mainboard/foxconn/g41s-k/devicetree.cb b/src/mainboard/foxconn/g41s-k/devicetree.cb
index b196e24..270d135 100644
--- a/src/mainboard/foxconn/g41s-k/devicetree.cb
+++ b/src/mainboard/foxconn/g41s-k/devicetree.cb
@@ -49,6 +49,8 @@
 			register "ide_enable_secondary" = "0x0"
 			register "sata_ports_implemented" = "0x3"
 
+			register "gen1_dec" = "0x003c0a01" # Super I/O EC and GPIO
+
 			device pci 1b.0 on end		# Audio
 			device pci 1c.0 on end		# PCIe 1
 			device pci 1c.1 on		# PCIe 2 (NIC)