Add production tools for secure boot SRK writing

Eberhard Stollrequested to merge
feature/add_secure_boot_functionalies into develop
  • Fix Command set_lan_mac_otp: Fix miscalculation of second MAC address if MAC address starts with zero
  • Add commands and infrastructure for handling SRK keys for secure boot: New commands activate_secure_boot, fuse_srk_keys, get_srk_keys, get_cpu_serial_no
  • Command flash_emmc_wic: Add configuration option b_resize_emmc to suppress resizing ext4 partition on eMMC. Default is b_resize_emmc=1 for compatibility.
  • Command flash_bl2emmc:
    • Add configuration value BOOTLOADER_OFFSET_KB. Default is 33 kBytes.
    • Set bootbus configuration for eMMC: mmc bootbus set single_backward x1 x8
  • Add convenience command get_bootconfig

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