skl mainboards/dt: Move genx_dec settings into LPC device scope

Change-Id: Iecb4851bedb7c9ed7793763d80acbcbb068e8832
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83172
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Jonathon Hall <jonathon.hall@puri.sm>
Reviewed-by: Erik van den Bogaert <ebogaert@eltan.com>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Marvin Evers <marvin.n.evers@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/purism/librem_skl/devicetree.cb b/src/mainboard/purism/librem_skl/devicetree.cb
index 03d48fa..5b222fc 100644
--- a/src/mainboard/purism/librem_skl/devicetree.cb
+++ b/src/mainboard/purism/librem_skl/devicetree.cb
@@ -34,9 +34,6 @@
 	register "gpe0_dw1" = "GPP_D"
 	register "gpe0_dw2" = "GPP_E"
 
-	# EC host command ranges are in 0x380-0x383 & 0x80-0x8f
-	register "gen1_dec" = "0x00000381"
-
 	# Disable DPTF
 	register "dptf_enable" = "0"
 
@@ -153,6 +150,8 @@
 		device ref pcie_rp5	on  end
 		device ref pcie_rp9	on  end
 		device ref lpc_espi	on
+			# EC host command ranges are in 0x380-0x383 & 0x80-0x8f
+			register "gen1_dec" = "0x00000381"
 			chip drivers/pc80/tpm
 				device pnp 0c31.0 on end
 			end