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Bug#927888: Need to disable the devicetree command in Secure Boot mode

Source: grub2
Version: 2.02+dfsg1-16
Severity: serious
Tags: security

In discussion with upstream EFI and arm64 folks, it's become clear
that in SB mode we should also be disabling the devicetree command in
Secure Boot mode. I'm testing a patch right now, coming shortly.

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-2-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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