Disable interrupts in early() (#641)

* Disable interrupts in early()

* enable interrupts before going into DFU mode

board/gpio.h

@@ -12,6 +12,7 @@ void jump_to_bootloader(void) {
   void (*bootloader)(void) = (void (*)(void)) (*((uint32_t *)0x1fff0004));
 
   // jump to bootloader
+  enable_interrupts();
   bootloader();
 
   // reset on exit
@@ -21,14 +22,12 @@ void jump_to_bootloader(void) {
 
 void early(void) {
   // Reset global critical depth
+  disable_interrupts();
   global_critical_depth = 0;
 
   // Init register and interrupt tables
   init_registers();
 
-  // neccesary for DFU flashing on a non-power cycled white panda
-  enable_interrupts();
-
   // after it's been in the bootloader, things are initted differently, so we reset
   if ((enter_bootloader_mode != BOOT_NORMAL) &&
       (enter_bootloader_mode != ENTER_BOOTLOADER_MAGIC) &&