mb/intel/adlnrvp: Skip sending the MBP HOB to save boot time

This change is to skip sending the MBP HOB since coreboot doesn't
use it and also helps to reduce the boot time by ~40msec on ADL-N.

Boot time data:
Before:
* 955:returning from FspSiliconInit    956,832 (110,268)
After:
* 955:returning from FspSiliconInit    944,528 (74,213)

BUG=b:241850107
TEST=Verified that boot time is reduced by ~40msec and also S0i3
is working.

Signed-off-by: V Sowmya <v.sowmya@intel.com>
Change-Id: I05d226fb5f05463341358cd20655f06376778bac
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66676
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Reka Norman <rekanorman@chromium.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>

src/mainboard/intel/adlrvp/devicetree_n.cb

@@ -154,6 +154,8 @@ chip soc/intel/alderlake
 		.vnn_icc_max_ma = 500,
 	}"
 
+	register "skip_mbp_hob" = "1"
+
 	device domain 0 on
 		device ref igpu on end
 		device ref dtt on