tuna: include tune-cortexa9

* default DEFAULTTUNE is now armv7a-neon
* meta-shr/conf/distro/include/defaulttunes.inc sets cortexa8t-neon which
  is shared by all compatible MACHINEs we support (om-gta04, crespo, nokia900, tuna)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
android-audiosystem: temporary inhibit debug split, debugedit is failing