usb: phy: qusb2: Keep regulators on in probe if EUD is enabled

EUD may be enable in boot loader and to keep EUD session alive across
kernel boot till USB phy driver is initialized based on cable status,
keep regulators on from USB high speed phy driver's probe. Regulators
shall get turn off while handling USB cable disconnect routine for
both boot up with and without USB cable case.

Change-Id: Ib078686a4757f615b1df5798831994dfb44c28f8
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>