Fixup bootloaders. (#16256)

keyboards/matrix/noah/noah.c

@@ -4,6 +4,11 @@
 
 #include "noah.h"
 
+void bootloader_jump(void) {
+    // This board doesn't use the standard DFU bootloader, and no information is available regarding how to enter bootloader mode. All we can do here is reset.
+    NVIC_SystemReset();
+}
+
 #ifdef RGBLIGHT_ENABLE
 #include <string.h>
 #include "rgblight.h"

keyboards/matrix/noah/rules.mk

@@ -10,6 +10,9 @@ MCU_LDSCRIPT = noah_boot
 #  or <this_dir>/boards
 BOARD = ST_NUCLEO64_F411RE
 
+# Bootloader selection
+BOOTLOADER = custom
+
 # Build Options
 #   change yes to no to disable
 #