Reject mmap if the selected device for policy mix doesn't support mmap.

When there is any policy mix that selects output device, mmap request
should be rejected if the selected output device doesn't support mmap
and the mix matches request.

Bug: 301619865
Test: atest audiopolicy_tests
Test: atest AudioPlaybackCaptureTest
Change-Id: I9c6d188a4d61fb9ac7d8424b35d165033a65247c