m8: Cleanup audio policy

 * Fix noise when playing notifications too

Change-Id: Ibe152597cd82afd6035c1b59b1517dc922242928
m8: Remote submix only accepts 48KHz

Change-Id: I13d706f1f8510227cc4350cff8339166a8545a45
Merge branch 'cm-11.0' into kk_mkt