Update changelog for M7

...and M6 and M5...

Change-Id: I5f900e6e4ab4807491dbd783f69caae9792b3ab1
Fix changelog typos

Change-Id: If217913697ccde09e3eeb8ae32b5bb429c925b1c
Build FFMPEG plugin for all targets

Mini targets didn't include FFMPEG so far.
I don't see the reason to do this, the plugin takes up minimal space.

Change-Id: I712982c245f9cdb8dd1052a071a7590219b9a9c3
Added apn settings for Mobitel and Etisalat, Sri Lanka (MCC=413)

Change-Id: If843bdfca224922c85e6e0e840988a5f85be868b