[FM] FM icon will disappear after unmounting SD card

Select "Start Recording" in options menu -> Press "Home"
key -> Enter Settings/Storage/Unmount SD card/OK ->Check
the notification bar after unmounting SD card, FM icon will
disappear after unmounting SD card.

The fix is to add the handling of message
FmListener.LISTEN_RECORDSTATE_CHANGED.

Bug 18861474

From: https://partner-android-review.googlesource.com/#/c/192419/1



Change-Id: I39abee765f6eab77865fb1fdb145fb1fb7eb23fe
Signed-off-by: Benson Huang <benson.huang@mediatek.com>