Move display_end before secmon + add boolean supp.

Currently bpmp loses access to the relevant registers when secmon or exosphere is launched.

This change provides support for all firmwares and properly sanitizes the display.

bootloader/utils/types.h

@@ -47,4 +47,8 @@ typedef volatile unsigned char vu8;
 typedef volatile unsigned short vu16;
 typedef volatile unsigned int vu32;
 
+typedef int bool;
+#define true  1
+#define false 0
+
 #endif