mb/google/trulo: Program EC ranges (host cmd and memory map)

This patch adds chip config entries for EC host cmd and memory map
ranges.

TEST=Able to build Google/Trulo.

Change-Id: Id4b0f3bba934c8da56b6d7ca8579b46b6cccac28
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82650
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Eric Lai <ericllai@google.com>

src/mainboard/google/brya/variants/baseboard/trulo/devicetree.cb

@@ -1,4 +1,11 @@
 chip soc/intel/alderlake
+
+	# EC host command ranges are in 0x800-0x8ff & 0x200-0x20f
+	register "gen1_dec" = "0x00fc0801"
+	register "gen2_dec" = "0x000c0201"
+	# EC memory map range is 0x900-0x9ff
+	register "gen3_dec" = "0x00fc0901"
+
 	device domain 0 on
 	end
 end