On the sandbox called without "--terminal raw" CTRL+C leaves U-Boot, "ESC/CTRL+C to quit" is misleading. Let's remove CTRL+C to quit key handling from bootmenu and eficonfig menu. Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>