UBUNTU: SAUCE: (no-up) rename the adv7511 drm driver to adv7511_drm

UBUNTU: SAUCE: (no-up) rename the adv7511 drm driver to adv7511_drm

BugLink: http://bugs.launchpad.net/bugs/1764816
This has the same name as another module, and due to some quirk
only one of them will get installed. Which one it is seems to be
nondeterministic, but if the drm module is missing in our
snapdragon flavor then the display and audio will fail to work.
Rename the module to avoid the duplication.

Acked-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>