arm: omap: phy: remove unused functions from omap-phy-internal.c

All the unnessary functions in omap-phy-internal is removed.
These functionality are now handled by omap-usb2 phy driver.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>