Framebuffer permissions, code review fixes

Added new signature-level permission "android.permission.GRAPHICS"
to allow svmpd to access the framebuffer device. The permission
is mapped to the "graphics" linux user, using it will allow that
Context to access any files that the "graphics" user has access to.
Co-commits:
android_device_mitre_svmp
android_external_svmp_eventserver
Change animation scale global settings

Altered the default values of ANIMATOR_DURATION_SCALE,
TRANSITION_ANIMATION_SCALE, and WINDOW_ANIMATION_SCALE to 0. This
disables extraneous animations that bog down the VM's video
rendering.
Have battery return status as fully charged

Change-Id: I9cb390153dc6d4e772f1630d8140c1be71f318c2
Signed-off-by: Ivan Lozano <ilozano@mitre.org>