mb/google/brox: Remove psys related implementation
psys is not an optimal solution for no/low battery boot. Hence remove
function and macros related to psys implementation.
BUG=b:
335046538
BRANCH=None
TEST=Build and boot on brox board
Change-Id: I6c0e9561367b5846b00be27012f002dd7c299414
Signed-off-by: Sowmya Aralguppe <sowmya.aralguppe@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84397
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Ashish Kumar Mishra <ashish.k.mishra@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>