dps: respect PD_MAX_CURRENT_MA when evaluating PDO
dps: respect PD_MAX_CURRENT_MA when evaluating PDO

PD_MAX_CURRENT_MA should be used when evaluating the PDO's
maximum power it can request.

BUG=b:169532537
TEST=none
BRANCH=cherry

Change-Id: Ia514e921b012b326fc314f33c2257f8082b42443
Signed-off-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3529601
Tested-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@google.com>
Commit-Queue: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@google.com>
Reviewed-by: Sam Hurst <500b4cddcd66abe3fe333e92c4c95d7f41e62e4e@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec