Convert CONFIG_VIDEO_OMAP3 to Kconfig

This converts the following to Kconfig:
   CONFIG_VIDEO_OMAP3

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/cm_t3517_defconfig b/configs/cm_t3517_defconfig
index edb114e..b2452ff 100644
--- a/configs/cm_t3517_defconfig
+++ b/configs/cm_t3517_defconfig
@@ -55,5 +55,6 @@
 CONFIG_USB_MUSB_HOST=y
 CONFIG_USB_MUSB_AM35X=y
 CONFIG_USB_STORAGE=y
+CONFIG_VIDEO_OMAP3=y
 CONFIG_LCD=y
 CONFIG_OF_LIBFDT=y