tinyalsa: Add support for mmap ops Bug: 166482201 Test: audio smoke tests Change-Id: I22a32a3aab02e56af1e6ae901de65e86a94d6196 Signed-off-by: Rohit kumar <rohitkr@codeaurora.org> Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>