Dialer: Add ability to set full screen photos for calls

@neobuddy89: Refactored and cleaned up.

Change-Id: I90ee1c30f7ab248e9fdb8b94d33434c23b327389
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: Pranav Temkar <pranavtemkar@gmail.com>
Signed-off-by: Jis G Jacob <studiokeys@blissroms.org>
22 files changed