mm-audio: Change delay value when setting device in call mode

commit 6ae807 (mm-audio: Fix delay at the start of MT voice call) has an issue.
That setting value is too aggressive, RINGTONE buffer is remained and routed
to connected device in call mode.

Add 40ms delay for playing ringtone.  This patch will increase about 40ms
for call connection time.

Bug:7946399
Change-Id: I98da5c515b5ba03b413818a8124c213d591c7bc3