asoc: routing: Pass correct port id to adm close

Currently based on fe_dai index backend dai port id is
selected and passed to adm_close api which is incorrect.
Fix it by using be_dai index to select backend dai port id.

Change-Id: I12affaf7b08d2f69264338d098c30600ed014220
Signed-off-by: Sachin Mohan Gadag <sgadag@codeaurora.org>