usb: phy: fix Kconfig warning

Recent commits introduced the following
Kconfig warning:

warning: (USB_MUSB_HDRC && OMAP_USB3) selects \
	OMAP_CONTROL_USB which has unmet direct \
	dependencies (USB_SUPPORT && ARCH_OMAP2PLUS)

This patch just fixes it, by removing the
unnecessary OMAP dependency.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/phy/Kconfig

@@ -27,7 +27,6 @@ config OMAP_USB3
 
 config OMAP_CONTROL_USB
 	tristate "OMAP CONTROL USB Driver"
-	depends on ARCH_OMAP2PLUS
 	help
 	  Enable this to add support for the USB part present in the control
 	  module. This driver has API to power on the USB2 PHY and to write to