[FM] FM recording name which contains "%" can not be played in FM

Select "Start Recording" in options menu -> Stop
recording and "Save recording" pops up -> Rename
the recording file to contain "%" -> Save recording
and tap "LISTEN", Saved recording file can not be played
and "Couldn't play the track you requested." displays.

The fix is to encode the record name.

from: https://partner-android-review.googlesource.com/#/c/192398/1



Bug 18849397

Change-Id: I2b58dad093865845fd598483e96775a192946c4c
Signed-off-by: Benson Huang <benson.huang@mediatek.com>