mb/google/brox: Add support for batteryless booting

Set PsysPL2 and PsysPL3 in addition to making adjustments
to PL2 and PL4 in order to prevent brownouts when we don't
have a battery or have an empty battery at boot time.

BUG=b:335046538,b:329722827
BRANCH=None
TEST=flash
     Able to successfully boot on a SKU1 with 45W, 60W+ adapters
     and SKU2 with a 60W or higher type C adapter.
     30W is still being worked on.

Change-Id: Ie36f16b2c938dce29cd2130a86fc8c08f5ba0902
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83087
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

0 files changed, 0 insertions, 0 deletions