HOVER: Theme Engine compatibilities

Use default notification dimens, avoid setting a custom one.
A bit of cleanup too.

Notifications:
Hardcode dimensions to android defaults. Avoid themes to change them,
Ribbons feature (present on CM based roms mostly) needs that.

Thanks to +John Xionidis to help me trick this out for full CM11 made
themes :)

Change-Id: I412993a2d54d800f7ef96d684fb9ce579e9326f8
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>