[FM] FM icon does not display in the notification bar when FM is playing

    FM powered up -> Select "Start Recording" in options menu
    -> Tap "STOP RECORDING" and "save recording" dialog pops up
    -> Tap Home key and check FM icon in the status bar,
    FM icon will not display in the status bar.

    The fix is to update playing notification when the saving
    dialog is shown.

    Bug 19001738

    Review: https://partner-android-review.git.corp.google.com/#/c/193404



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

Change-Id: I2edd7c548c736cf58b1e8ae13da3c0b4f62ea031