mb/google/volteer/variants: Update Power Limit2 minimum value

Update Power Limit2 (PL2) minimum value to the same as maximum value for
volteer variants like baseboard, delbin, eldrid, terrador and todor.
All other variants uses the DTT entries from baseboard devicetree since
there is no override present for those variants. DTT does not throttle PL2,
so this minimum value change here does not impact any existing behavior on
the system.

BUG=None
BRANCH=volteer
TEST=Build and test on volteer system

Change-Id: I568e87c87ef517e96eaab3ff144b1674d26ae1e6
Signed-off-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48292
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
index 1b3b1cc..353aa27 100644
--- a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
@@ -401,7 +401,7 @@
 						.time_window_min = 28 * MSECS_PER_SEC,
 						.time_window_max = 32 * MSECS_PER_SEC,
 						.granularity = 200,},
-					.pl2 = {.min_power = 15000,
+					.pl2 = {.min_power = 60000,
 						.max_power = 60000,
 						.time_window_min = 28 * MSECS_PER_SEC,
 						.time_window_max = 32 * MSECS_PER_SEC,