mb/intel/mtlrvp: Configure GPIO Tier-1 GPEs for MTL-RVP

Configure GPIO Tier-1 GPE's that defines the route for GPE
events for MTL-RVP. Configure GPE route as below,
PMC_GPE0_DW0 -> GPP_B
PMC_GPE0_DW1 -> GPP_D
PMC_GPE0_DW2 -> GPP_E

BUG=b:224325352
TEST=Able to build with the patch and boot the mtlrvp to ChromeOS
using subsequent patches in the train

Signed-off-by: Harsha B R <harsha.b.r@intel.com>
Change-Id: Ieab95b72ade75734b0788a32566649d90acbc48a
Signed-off-by: Jamie Ryu <jamie.m.ryu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70872
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Krishna P Bhat D <krishna.p.bhat.d@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
diff --git a/src/mainboard/intel/mtlrvp/variants/baseboard/mtlrvp_p/devicetree.cb b/src/mainboard/intel/mtlrvp/variants/baseboard/mtlrvp_p/devicetree.cb
index 649a44f..10b4cea 100644
--- a/src/mainboard/intel/mtlrvp/variants/baseboard/mtlrvp_p/devicetree.cb
+++ b/src/mainboard/intel/mtlrvp/variants/baseboard/mtlrvp_p/devicetree.cb
@@ -1,5 +1,10 @@
 chip soc/intel/meteorlake
 
+	# GPE configuration
+	register "pmc_gpe0_dw0" = "GPP_B"
+	register "pmc_gpe0_dw1" = "GPP_D"
+	register "pmc_gpe0_dw2" = "GPP_E"
+
 	# EC host command ranges are in 0x800-0x8ff & 0x200-0x20f
 	register "gen1_dec" = "0x00fc0801"
 	register "gen2_dec" = "0x000c0201"