ASoC: msm: Add support for ASM loopback

Add ASM loopback driver. When audio path wants to use filters in DSP,
it will do a loopback in ASM.  The new ASM loopback driver enables
the loopback.

Change-Id: I3ddfbf0a1be5b3b1d37b47b44d321ea7da93da83
Signed-off-by: Damir Didjusto <damird@codeaurora.org>
Signed-off-by: Vimal Puthanveed <vimalp@codeaurora.org>
Restore some changes lost in the Update3 merge

Change-Id: I9f4750dde45736fb5a98d538042b5e2b6f6d916f
sound: Copy audio_effects.h for userspace

Change-Id: Iad6c5a25856feba8154988f246e50ef22d956344