msm8974: Prevent USB h/w reset on every cable disconnect

Due to some issue with older USB PHYs, USB h/w requires to be
RESET everytime cable is diconnected. Avoid this on 8974's
USB core which doesn't have this issue.

Change-Id: I918492032de6d65eaba7c9b656c700d4f443aa99
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
3 files changed