usb: Fix usb issues during reboot

Added error handling in adb_release.
Fixed warning in ab8500 usb due to the phy_disable call when the
usb phy wasn't enabled.

Change-Id: Ie3a1021a8d80d1b0722d3d4efc19ed5e4a515718
Signed-off-by: supriya karanth <supriya.karanth@stericsson.com>