Fix android black screen crash

Change-Id: I7a0eb121ff151b8b6e8f824ee8dbab8d99b73499
Separate keymaps for YH-820 and YH-920/925

Although both players basically have the same keys, the
differences in the layout is rather big, so I think both
deserve their own keymaps.

(On the yh820 the FFWD/PLAY/REW buttons are located above the
direction keys, on the yh920 at the side of the player.
Furthermore the yh920/925 has a REC switch, whereas
yh820 has a push button.)

Change-Id: I0e62a1b101c387646c0bdb07ea142d9d2430ca15
Reviewed-on: http://gerrit.rockbox.org/814
Reviewed-by: Szymon Dziok <b0hoon@o2.pl>
Fix the simulators.

Change-Id: I9663f709b5979fffea3962e2062de3821a264c23
Fix crash when detecting a player in MTP mode.

Change-Id: I65bf6928584735d6a179750c313fb8e7dcf7add5
Update polish translation for Rockbox Utility (FS#12979)

Change-Id: Iaca68eb72e030964b5692d03b03e312b8b05b05a