usb: host: xhci: make sure to power up PHY

some boards won't work if the PHY isn't explicitly
powered up.

Signed-off-by: Felipe Balbi <balbi@ti.com>
arm: dra7xx: prcm: add missing registers

some boards might want to use USB1 for host,
without fiddling those registers it'll be
impossible.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: phy: omap_usb_phy: fix build breakage

there's no such function usb3_phy_power(),
it's likely that author meant to call,
usb_phy_power() instead, but that's already
called properly from xhci-omap.c.

Signed-off-by: Felipe Balbi <balbi@ti.com>