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use CONFIG_AUTOBOOT_KEYED to only let autoboot be interrupted by the space character

Johannes Schauer Marin Rodrigues requested to merge josch/reform-boundary-uboot:autoboot_keyed into master

When connecting a FTDI FT232RL usb to ttl uart adapter to the reform with TX, RX and GND but not connecting that adapter to another machine via usb, then the adapter will send garbage signals to the reform during boot. These will interrupt autoboot and prevent the reform from booting until either the RX/TX/GND are disconnected or the adapter is connected via USB to another machine.

To prevent this from happening, do not interrupt autoboot on any key press but require the space key to be pressed.

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