usb: qusb: Remove the PHY_HOST_MODE check from set_suspend

The PHY_HOST_MODE check in the set_suspend call to
distinguish between low power mode exit and bus suspend
exit is redundant as the cable_connected flag
distinguishes the same.

Change-Id: I9a422ee5cb24553217a03bf6d1eb0750a6793836
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>