mb/glkrvp: Set PNP config to PNP_PERF_POWER

This patch sets the PNP config value to PNP_PERF_POWER.
The config values for soc can be found in chip.h

TEST = Built and booted glkrvp, verified warm and cold
reboot and suspend resume.

Change-Id: Ia390c0fafe2de64bd9e4ca44e5ed5d904663ae3c
Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Reviewed-on: https://review.coreboot.org/25309
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/intel/glkrvp/variants/baseboard/devicetree.cb b/src/mainboard/intel/glkrvp/variants/baseboard/devicetree.cb
index 5a54430..f9ed3cf 100644
--- a/src/mainboard/intel/glkrvp/variants/baseboard/devicetree.cb
+++ b/src/mainboard/intel/glkrvp/variants/baseboard/devicetree.cb
@@ -98,6 +98,8 @@
 	# 0x08000000 - 128MiB
 	register "PrmrrSize" = "128 * MiB"
 
+	register "pnp_settings" = "PNP_PERF_POWER"
+
 	device domain 0 on
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 on  end	# - DPTF