dsp: fix shared buffer format mixer control

Due to SVA5 supports multiple sound models in a
signle SVA session, shared buffer format mixer
control will be called several time to set the
afe data format within one session. This behavior
can exhaust all available afe data format sessions
without freeing them at the end of a SVA session.
Fix this issue by using fe_id to find the matching
SVA session when set afe data format.

Change-Id: I3332b9ff88df2b14eb3e59036164f11ad3342e14
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>