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Much like on x86, we can work out if the system is running on top of EFI firmware. If so, return "arm-efi". If not, fall back to "arm-uboot" as previously. Split out the code to (maybe) load the efivar module and check for /sys/firmware/efi into a common helper routine is_efi_system(). Signed-off-by: Steve McIntyre <93sam@debian.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>