ASoC: msm: Add routing for HFP using AFE and ASM Loopback

HFP hostless driver is used to loopback BT data into
SLIM_0_RX. And asm loopback MM6 is used for looping
data from mic to BT so that pre_proc effects can be
added.

Change-Id: I1176d475f7f5cc9306705855acd3c0172f0d7b21
Signed-off-by: Vimal Puthanveed <vimalp@codeaurora.org>