phy: qcom-ufs: set no runtime PM callbacks flag

UFS PHY power management is managed by its parent (UFS host controller)
hence set the no runtime PM callbacks flag on UFS PHY device to
avoid any accidental attempt to call the PM callbacks for PHY device.

Change-Id: I06e6b140a98233e30d406754f0cdcdd27c834357
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>