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

Update Power Limit2 (PL2) minimum value to the same as maximum value for
dedede variants (baseboard and drawcia). Currently, variants like boten,
waddledee, waddledoo, metaknight and wheelie uses the DTT entries from
baseboard devicetree since there is no override present for these variants.
So, these variants will also reflect this change of PL1 minimum value.
For madoo variant, PL2 minimum value already set the same as PL2 maximum
value. DTT does not throttle PL2, so this minimum value change here does not
impact any existing behavior on the system.

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

Change-Id: I7ecf1ffcc7871192ebe18eb8c3c3fd3e1193721e
Signed-off-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47154
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/dedede/variants/baseboard/devicetree.cb

@@ -212,7 +212,7 @@ chip soc/intel/jasperlake
 						.granularity = 200,
 					},
 					.pl2 = {
-						.min_power = 6000,
+						.min_power = 20000,
 						.max_power = 20000,
 						.time_window_min = 1 * MSECS_PER_SEC,
 						.time_window_max = 1 * MSECS_PER_SEC,

src/mainboard/google/dedede/variants/drawcia/overridetree.cb

@@ -115,7 +115,7 @@ chip soc/intel/jasperlake
 						.granularity = 200,
 					},
 					.pl2 = {
-						.min_power = 6000,
+						.min_power = 20000,
 						.max_power = 20000,
 						.time_window_min = 1 * MSECS_PER_SEC,
 						.time_window_max = 1 * MSECS_PER_SEC,