Don't wake the screen for media playback KeyEvents

Media playback KeyEvents wake up the screen, except HEADSETHOOK.
Devices connected via AVRCP use different codes.
Add rest of the playback events to the filter.

Filtered KeyEvent list after this patch:
HEADSETHOOK
MEDIA_PLAY_PAUSE
MEDIA_STOP
MEDIA_NEXT
MEDIA_PREVIOUS
MEDIA_REWIND
MEDIA_FAST_FORWARD
MEDIA_PLAY
MEDIA_PAUSE

PS2-3: Amended commit msg & removed debug line

Change-Id: I378e33081e9c43c44a28bdd29ce221d48b6108c4
Signed-off-by: Gergely Szell (sethyx) <szell@hu.ibm.com>