USB: ehci-msm2: Fix USB lpm issue after failure to suspend PHY

Whenever suspend routine is called and if fails to suspend
PHY, will return -ETIMEDOUT to PM core. Due to this, PM core
will set runtime error flag for the device. This leads to
subsequent suspend routines are not being called and USB does
not enter low power mode. Hence disable runtime PM and reenable
it after recovery mechanism of removing and adding hcd.

Change-Id: I44cc4c7c624887dfc1ecd23bd57f460479cb3f26
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>