[FM] FM will not change to FM main view after re-plugging in the earphone

Launch FM and play -> Plug out headphone quickly ->
Plug in headphone quickly -> Repeat step 2~3 several
times -> Check the FM screen, FM will not change to FM
main view after re-plugging in the earphone.

The fix is to let FM change to main activity after re-plugging
in the earphone.

Bug 18836352
from: https://partner-android-review.googlesource.com/#/c/192346/



Change-Id: Ib924356e83f794560b91e47b5b35f2087eb876d7
Signed-off-by: Benson Huang <benson.huang@mediatek.com>