Adjust boot leds
Adjust boot leds

UI:
- 2x slow blink when the bootloader initializes
- 10-20x fast blink when updating fails (10x for each core)
- 5x slow blink after a succesfull update

Note that after a succesfull update, the mcu is reset causing the
bootloader to run again.

JitterCompany/bootloader43xx_sdcard