dsp: add VPM_TX_SM_ECNS_COPP_TOPOLOGY for single mic ecns

In order to select sample rate, add check for SM_ECNS
topology to provide backward compatibility.

Change-Id: If722e34ec4ccb224b1b28cfa7df0b10674bf7dba
Signed-off-by: Bala Kishore Pati <balakishorepati@codeaurora.org>