g2c1: automatically include any enabled kernel modules in images

Signed-off-by: Steve Sakoman <steve@sakoman.com>
linux-g2c: update recipe to support sitronix touchscreen controller

Updates defconfig to build sitronix and mxs drivers as modules
Updates kernel recipe to use imx-2.6.35-mx28-next branch of kernel repo

Signed-off-by: Steve Sakoman <steve@sakoman.com>
tsinit: add recipe for touchscreen init

The touchscreen init tests for the presence of the sitronix controller
and if present loads the sitronix kernel module.  If not present
it loads the mxs-ts kernel module.

The touchscreen init is configured to run before x11 is started.

Signed-off-by: Steve Sakoman <steve@sakoman.com>
packagegroup-custom-x11: add tsinit to packagegroup-custom-x11-apps

Signed-off-by: Steve Sakoman <steve@sakoman.com>