asoc: add AFE logging PID and APIs

The current AFE logging point is global, once enabled all active
AFE ports will log its data through DIAG to PC, However, diag
logging throughput is limited.
Need add kcontrol for enable/disable AFE logging by AFE port
per direction.

Change-Id: I05a12f2eb4bc5b5a3ad39b8bbf2f4148bec05002
Signed-off-by: Deru Wang <deruwang@codeaurora.org>