CYAN-457: Add Advanced Audio Coding mimetypes

m4a audio/aac
m4b audio/aac
m4p audio/aac
m4r audio/aac
m4v video/x-m4v

Change-Id: Ia4e852adcc4b6d77b8947f6bdf6d8ffaf5d8505f
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>