Audio HAL updates from N7100

Credits:
Javier Ferrer <javi.f.o@gmail.com>
Marc <herderkewitz@googlemail.com>
Utkarsh Gupta <utkarsh.eminem@gmail.com>

Change-Id: If764d4b828391c54bb12577859cb7f2ed376655f
selinux: Remove redundant policy

Change-Id: If3ff107f60d9f15f2aaa4b73c955d6ac2b1cbd5a
SELinux updates

Change-Id: I3b7e6ad3741c9f08151b9b2326d06f872e6e21c4
audio: More sensitive mic, less noise

Change-Id: I527133a4e5db92da5c162f7548b759e2b5c9b0c4