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/51nb/x210/devicetree.cb b/src/mainboard/51nb/x210/devicetree.cb
index 51cb89a..7a77e64 100644
--- a/src/mainboard/51nb/x210/devicetree.cb
+++ b/src/mainboard/51nb/x210/devicetree.cb
@@ -26,9 +26,6 @@
 	register "gpe0_dw1" = "GPP_D"
 	register "gpe0_dw2" = "GPP_E"
 
-	register "gen1_dec" = "0x000c0681"
-	register "gen2_dec" = "0x000c1641"
-
 	# Disable DPTF
 	register "dptf_enable" = "0"
 
@@ -114,6 +111,9 @@
 		device ref pcie_rp4	on  end
 		device ref pcie_rp9	on  end
 		device ref lpc_espi	on
+			register "gen1_dec" = "0x000c0681"
+			register "gen2_dec" = "0x000c1641"
+
 			chip ec/51nb/npce985la0dx
 				device pnp 0c09.0 on end
 				device pnp 4e.5   on end