YH8xx,YH9xx: Keymap improvement

The main "innovation" in this patch are two "virtual buttons"
for the record switch on YH92x targets. When the switch state
changes, a single BUTTON_REC_SW_ON or .._OFF button event will
be generated. Thus keymap code can react on switching, but
not on the actual state of the switch.

Wherever sensible, the following user scheme is applied:
- use PLAY as confirm button
- use REW button or Long REW to exit
- use REC (YH820) or FFWD (YH92X) as modifier key for button combos

Change-Id: Ic8d1db9cc6869daed8dda98990dfdf7f6fd5d5a1

apps/plugins/invadrox.c

@@ -211,10 +211,11 @@ CONFIG_KEYPAD == MROBE500_PAD
 #elif (CONFIG_KEYPAD == SAMSUNG_YH820_PAD) || \
       (CONFIG_KEYPAD == SAMSUNG_YH920_PAD)
 
-#define QUIT  BUTTON_REC
+#define QUIT  BUTTON_REW
 #define LEFT  BUTTON_LEFT
 #define RIGHT BUTTON_RIGHT
 #define FIRE  BUTTON_PLAY
+#define FIRE2 BUTTON_UP
 
 #elif CONFIG_KEYPAD == PBELL_VIBE500_PAD
 
@@ -304,7 +305,11 @@ CONFIG_KEYPAD == MROBE500_PAD
 #define ACTION_QUIT  (QUIT | RC_QUIT)
 #define ACTION_LEFT  LEFT
 #define ACTION_RIGHT RIGHT
+#ifndef FIRE2
 #define ACTION_FIRE  FIRE
+#else
+#define ACTION_FIRE  (FIRE | FIRE2)
+#endif
 
 #endif