Added patch to query VFD display type

This patch provides a proc entry to get the vfd size.

/proc/aotom/display_type

Currently either 4 chars or 8 chars are supported.

Signed-off-by: Christian Ege <k4230r6@gmail.com>
Merge branch 'denzil-next' of github.com:project-magpie/meta-stlinux into denzil-next