usb: phy: qusb: Enable regulators in cable connect case

This change enables regulators during cable connect case
and fix load setting so that when driver removes load only
when the regulator actually gets disabled.

Change-Id: Ic025e92feef30603b3a4f15517e0b497d27f8929
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>