skl mainboards/dt: Move serirq setting into LPC device scope

Change-Id: I84da5365907664ce223dec4adb22a8f1a6e2a144
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83188
Reviewed-by: Jonathon Hall <jonathon.hall@puri.sm>
Reviewed-by: Marvin Evers <marvin.n.evers@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Erik van den Bogaert <ebogaert@eltan.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/src/mainboard/protectli/vault_kbl/devicetree.cb b/src/mainboard/protectli/vault_kbl/devicetree.cb
index 5565064..228676b 100644
--- a/src/mainboard/protectli/vault_kbl/devicetree.cb
+++ b/src/mainboard/protectli/vault_kbl/devicetree.cb
@@ -17,9 +17,6 @@
 	# Disable DPTF
 	register "dptf_enable" = "0"
 
-	# Enable SERIRQ continuous
-	register "serirq_mode" = "SERIRQ_CONTINUOUS"
-
 	register "tcc_offset" = "5" # TCC of 95C
 
 	# FSP Configuration
@@ -198,6 +195,8 @@
 				"SlotLengthShort" "WIFI1" "SlotDataBusWidth1X"
 		end
 		device ref lpc_espi	on
+			register "serirq_mode" = "SERIRQ_CONTINUOUS"
+
 			register "gen1_dec" = "0x00fc0201"
 			register "gen2_dec" = "0x007c0a01"
 			register "gen3_dec" = "0x000c03e1"