bt: Unset multi channel bit for 44.1/88.2Khz A2DP Rx

When opening port for 44.1/88.2KHz A2DP Rx, explicitly
unset multi channel bit. This is required because for SCO/A2DP
with other sample rates, we set the multi channel bit. The
bit remains set even after the channel is removed and until we
expliciltly unset again.

CRs-Fixed: 2161323
Change-Id: I6890647a51a07d7eefed4b8ce654a1578ad67061
Signed-off-by: Satish Kodishala <skodisha@codeaurora.org>