ecore-drm2: Add API for vt-switching

ecore-drm2: Add API for vt-switching

This commit adds a function we can call from inside Enlightenment in
order to fix an issue with VT-Switching. The problem was when a client
application is open, the compositor does not pass along the key-combo
for vt-switch but rather sends it to an application. This patch (along
with upcoming Enlightenment one) fixes the issue.

NB: This late API add approved by Stefan ;)

@feature

Signed-off-by: Chris Michael <cp.michael@samsung.com>