Add option to display the OSD logo on arming

Adds `osd_logo_on_arming` setting with values `OFF, ON, FIRST_ARMING` (defaults to `OFF`). Optionally displays the OSD splash logo durin the "ARMING" message.

src/main/cli/settings.h

@@ -139,6 +139,9 @@ typedef enum {
     TABLE_INTERPOLATED_SP,
     TABLE_DSHOT_BITBANGED_TIMER,
     TABLE_OSD_DISPLAYPORT_DEVICE,
+#ifdef USE_OSD
+    TABLE_OSD_LOGO_ON_ARMING,
+#endif
 
     LOOKUP_TABLE_COUNT
 } lookupTableIndex_e;