Revert "mb/google/nissa/var/telith: Add 6W and 15W power limit parameters"

This reverts commit c89ccaf281.

Reason for revert: b:378775630#comment11
Intel believes that the AC only issue should be addressed head-on and
the previous power limit default settings should be maintained.

BUG=b:378775630
TEST=emerge-nissa coreboot chromeos-bootimage

Change-Id: I9f8344288a1811bddce702c16a244e3d4a59f195
Signed-off-by: Rui Zhou <zhourui@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85276
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>

src/mainboard/google/brya/variants/rull/overridetree.cb

@@ -140,14 +140,9 @@ chip soc/intel/alderlake
 
 	# Power limit config
 	register "power_limits_config[ADL_N_041_6W_CORE]" = "{
-		.tdp_pl1_override = 15,
-		.tdp_pl2_override = 20,
-		.tdp_pl4 = 45,
-	}"
-	register "power_limits_config[ADL_N_081_15W_CORE]" = "{
 		.tdp_pl1_override = 15,
 		.tdp_pl2_override = 25,
-		.tdp_pl4 = 45,
+		.tdp_pl4 = 78,
 	}"
 
 	device domain 0 on