Display related clean-up from Tomi Valkeinen.

These were separated from the DSS driver changes to leave out
a dependency between the driver and arch/arm related code.

As agreed on the mailing lists, these are based on Tomi's
platform_data header branch at:

git://gitorious.org/linux-omap-dss2/linux.git 3.10/0-dss-headers

Note that these patches have already been in Linux next via
Tomi's tree. As Tomi's driver changes are getting merged via
the drm tree because of another dependency, these should get
merged via the ARM SoC tree.

Apologies for the late pull request on this one, this dependency
should have been cleared away earlier.
Merge branch '3.10-lo/board-cleanup' of git://gitorious.org/linux-omap-dss2/linux into omap-for-v3.10/dss