Support keyboard in VirtuablBox image

qemux86 and Virtual Box use different eventX inputs for the keyboard
and touchpanel device.

In order for the same build to work with both:

- Add udev rule to link to the correct touchpanel event
- Add udev rule to create a keyboard0 symlink to the correct device
- Use keyboard0 instead of an explicit eventX for key input

Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@palm.com>

Change-Id: Ia7d003af791969f68d9ce2a6b6094abe3e3c3b44
Reviewed-on: http://g2g.palm.com/1312
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <keith.derrick@palm.com>
Tested-by: Keith Derrick <keith.derrick@palm.com>
Reviewed-by: Sapna Todwal <sapna.todwal@palm.com>