otg: msm_otg: fix otg boost ordering

While turning on the OTG, the charger should be configured to not draw
any current from the usb before turning on the 5V boost. While turning
off the OTG, the boost should be turned off before configuring the
charger to draw current from usb.

Fix this ordering.

Change-Id: Iebd9bf166334e34d92b2ada623dec71a5f0326eb
CRs-Fixed: 338648
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>