USB: phy-msm-qusb: Enable autoresume only when device is connected

Currently driver is enabling autoresume feature even if no device is
connected which is not required. Hence enable auto resume only when
any HS/FS/LS devices are connected during bus suspend.

Change-Id: I8150a571e11ccc128298fe75acef21ffe9b08a9a
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>