charger: initialize dedicated charger port
charger: initialize dedicated charger port

usb_charger should also initialize DEDICATED supplier type in its init
function. Otherwise charger_manager will not initialized properly.

BUG=b:128386458
BRANCH=none
TEST=set CONFIG_DEDICATED_CHARGE_PORT_COUNT=1, build and deploy on kukui.
     make sure charge_manager_get_best_charge_port() is triggered.

Change-Id: Ie90598403fd98c30075f3dda6d030af9d9c9bd2b
Signed-off-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1535088
Commit-Ready: ChromeOS CL Exonerator Bot <fa429e5907f00867f797423aea74327bb02c91b6@appspot.gserviceaccount.com>
Tested-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

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