r2p: Update r2p payload

2 modes:
- With updater2p; Forces the reboot to payload binary to be hekate
- Without; Checks if hekate and then if old

bootloader/config/config.h

@@ -29,6 +29,7 @@ typedef struct _hekate_config
 	u32 backlight;
 	u32 autohosoff;
 	u32 autonogc;
+	u32 updater2p;
 	char *brand;
 	char *tagline;
 	// Global temporary config.