Convert CONFIG_USB_MUSB_HCD et al to Kconfig

This converts the following to Kconfig:
   CONFIG_USB_MUSB_HCD
   CONFIG_USB_MUSB_UDC
   CONFIG_USB_DAVINCI
   CONFIG_USB_OMAP3
   CONFIG_USB_DA8XX
   CONFIG_USB_AM35X

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/omap3_evm_defconfig b/configs/omap3_evm_defconfig
index 1fb775f..0ae1852 100644
--- a/configs/omap3_evm_defconfig
+++ b/configs/omap3_evm_defconfig
@@ -56,6 +56,7 @@
 CONFIG_OMAP3_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_OMAP3=y
 CONFIG_USB_MUSB_GADGET=y
 CONFIG_USB_MUSB_OMAP2PLUS=y
 CONFIG_USB_GADGET=y