ST_ERICSSON: Adding multimedia extension

adapted from
commit 151ce20c17e1a097a2edf5b467650941a1cc6287
Author: Patrik Ryd <patrik.ryd@stericsson.com>
Date:   Thu Apr 5 20:18:30 2012 +0000

    Adding multimedia extension

    More specifically:

    - Add support for ST-Ericsson native pixel formats and conversion to
    and from these formats.
    - The Khronos headers are out of date and Mali extensions are missing from
    the extension headers. GLES2/gl2ext.h has been updated with the missing ARM
    extensions.
    - ST-Ericsson audio support for multimedia.
    - ST-Ericsson video support for multimedia.

Change-Id: I716bdd850bc0e3ef783f7814e98e39c53f70d7e4