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/igep00x0_defconfig b/configs/igep00x0_defconfig
index d70d4c6..d8ece6b 100644
--- a/configs/igep00x0_defconfig
+++ b/configs/igep00x0_defconfig
@@ -40,6 +40,9 @@
 CONFIG_SMC911X_32_BIT=y
 CONFIG_SYS_NS16550=y
 CONFIG_OMAP3_SPI=y
+CONFIG_USB=y
+CONFIG_USB_MUSB_UDC=y
+CONFIG_USB_OMAP3=y
 CONFIG_FAT_WRITE=y
 CONFIG_BCH=y
 CONFIG_OF_LIBFDT=y