[FM] FM radio should not search station automatically after tapping radio...

[FM] FM radio should not search station automatically after tapping radio station button the second time

First time launch FM -> Tap radio station button
-> Wait searching complete -> Back to FM main view
-> Tap radio station button again, FM is mute and
searching starts automatically.

The fix is to let FM play normally and searching
should not start automatically.

https://partner-android-review.git.corp.google.com/#/c/188804/



Bug 18762700

Change-Id: I3ec4185a553f398b28e09c3a2f215b75ce62bc5d
Signed-off-by: Benson Huang <benson.huang@mediatek.com>