[PATCH] v4l: use saa7111 i2c module in V4L MXB driver

From: Michael Hunold <hunold@convergence.de>

The attached patch changes my "Multimedia eXtension Board" (MXB)
Video4Linux-driver to use the standard saa7111 video decoder infrastructure
(to which I recently submitted changes through Ronald Bultje) instead of
some home-brewn direct-access stuff.

Nothing serious, but it removes code duplication and makes the code use the
video decoder api.