updater: blank check before erasing fw partition. Also fix nasty bug in bootloader spiflash waitwritecomplete().

Bootloader improvements: reset flash chip before leaving bootloader, global unlock it in case we are starting from a POR and not a reboot
Also add a progress indicator on the console.

add MTD ops in mtdchar ioctls
remove control of internal leds in the bootloader
flash external red during bootloader execution, start external orange to signal download mode.

add openocd script to reboot board