V4L/DVB (4894): Mxb: fix to load the proper i2c modules

Change order of module requests, so that tuner module is loaded at the end,
because the tuner module probes multiple i2c addresses and might grab an i2c
address that is not a tuner but something else.

Signed-off-by: Michael Hunold <hunold@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>