TWL4030 Add usb PHY support

The twl4030 provides a PHY device for connecting a link device,
like musb, to physical connection.

This change adds the twl4030 usb registers and functions for
initializing the PHY as required by omap3.

Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
diff --git a/Makefile b/Makefile
index 536ccb3..b3ab8b3 100644
--- a/Makefile
+++ b/Makefile
@@ -243,6 +243,7 @@
 LIBS += drivers/usb/gadget/libusb_gadget.a
 LIBS += drivers/usb/host/libusb_host.a
 LIBS += drivers/usb/musb/libusb_musb.a
+LIBS += drivers/usb/phy/libusb_phy.a
 LIBS += drivers/video/libvideo.a
 LIBS += drivers/watchdog/libwatchdog.a
 LIBS += common/libcommon.a