commit 24b923f0 upstream.

This device uses GPIOs: 28 to switch between analog and
digital modes: on digital mode, it should be set to 1.

The code that sets it on analog mode is OK, but it misses
the logic that sets it on digital mode.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>