ALSA: jack: Add support to report second microphone

ALSA jack framework currently supports reporting only
one single microphone. Add support to report presence of
second microphone to userspace.

Change-Id: I5b9a81439f1216c9b0506c11bff1ff992162fc5d
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>