Thus users are able to exit from fastboot by pressing a key. It's also possible to bail out by running `fastboot continue` from the host, but it's nice to be consistent with UMS. Also convenient to be able to bailout during testing if USB isn't working properly. Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Mattijs Korpershoek <mkorpershoek@kernel.org> Reviewed-by: Casey Connolly <casey.connolly@linaro.org> Signed-off-by: Sam Day <me@samcday.com> Reviewed-by: Mattijs Korpershoek <mkorpershoek@kernel.org> Link: https://patch.msgid.link/20260619-fastboot-abort-keyed-v2-2-684e53949a42@samcday.com Signed-off-by: Mattijs Korpershoek <mkorpershoek@kernel.org>