mondrianwifi: Add Torch using the camera interface

Enabling Torch mode via the sysfs interface causes the tablet to
reboot.  I suspect that the flash is drawing too much power and
that going via the camera interface is required to ensure that
sufficient power is being provided.

Either way, using the camera interface seems to work.

Change-Id: Ibcf0e70eed2ffe5b7347162c745bffc35cf1e60a
Merge branch 'cm' into HEAD