mb/google/skyrim/var/frostflow: Update Package Power Parameters

Follow thermal table to modify setting.
"stapm_time_constant_s" = "200" to "275"

BRANCH=none
BUG=b:257149501
TEST=emerge-skyrim coreboot

Signed-off-by: John Su <john_su@compal.corp-partner.google.com>
Change-Id: I7fe05fe1c17258a3323b8d04302212e76a388797
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72934
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Frank Wu <frank_wu@compal.corp-partner.google.com>

src/mainboard/google/skyrim/variants/frostflow/overridetree.cb

@@ -11,9 +11,6 @@ fw_config
 end
 
 chip soc/amd/mendocino
-	# Set Package Power Parameters
-	register "stapm_time_constant_s" = "200"
-
 	# Power table for tablet mode
 	register "sustained_power_limit_mW_tablet" = "12000"