usb: phy: snps: Enable auto resume during host mode suspend

Auto resume feature will keep dp/dm lines in resume state till SW has
chance to turn on clocks and handle line-state interrupt and drive
resume signaling. usb2 host needs to hold the resume signal after
device initiates remote wakeup signaling which can be from 1ms to 15ms.
Auto resume will help to hold the dp/dm lines in resume state if device
drives remote wakeup for short duration (like 1ms) and expects host to
hold the state.

Change-Id: Ic80f067240c1540caa8822c072548d096ff17680
Signed-off-by: Mayank Rana <mrana@codeaurora.org>