power: smb1360: update USB status immediately after enabling charger

Update USB online status change after setting CHARGING_ENABLED
property. This notifies it to the userspace immediately.

CRs-Fixed: 735650
Change-Id: Ifb517c4b6a96fb1496074534e39a6b32e4f28a1d
Signed-off-by: Jie Cheng <rockiec@codeaurora.org>