TWSP-HFP: Trigger microphone switch properly while put one earbud In Ear

While one EB move to In Ear state, the other EB is still Out of Ear state
but it is latest selected active microphone. Trigger microphone switch to
the current In Ear earbud.

Change-Id: Ia2fd823b860e2d600c7c0a4d2deb24ead6979a1b
1 file changed