We have a common chipset interface for performing a warm reset of the
AP, so move the implementation from system_warm_reboot() there. (It
was never a system function anyway; system = EC+AP; chipset = AP)
No functional change; just renaming functions.
BUG=chrome-os-partner:18343
BRANCH=none
TEST=build daisy,snow,spring,mccroskey
Change-Id: Ibc2c5efced5660c4335cd1868470184397800acd
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/45891