Remove unused REGA emergency alarm feature (ENABLE_REGA)

App/ui/ui.c

@@ -30,9 +30,6 @@
 #ifdef ENABLE_FMRADIO
     #include "ui/fmradio.h"
 #endif
-#ifdef ENABLE_REGA
-    #include "app/rega.h"
-#endif
 #ifdef ENABLE_FEAT_F4HWN_RXTX_LOG
     #include "app/rxtx_log.h"
 #endif
@@ -67,10 +64,6 @@ void (*UI_DisplayFunctions[])(void) = {
 #ifdef ENABLE_FEAT_F4HWN_RXTX_LOG
     [DISPLAY_RXTX_LOG] = &UI_DisplayRxTxLog,
 #endif
-
-#ifdef ENABLE_REGA
-    [DISPLAY_REGA] = &UI_DisplayREGA,
-#endif
 };
 
 static_assert(ARRAY_SIZE(UI_DisplayFunctions) == DISPLAY_N_ELEM);