[Bug 1921539] Re: Add support for SBAT

[Yuan-Chen Cheng]

follow up #29, per the built un-signed fwupdx64.efi, it does have the
sbat section.

$ objdump -h ./fwupdx64.efi

./fwupdx64.efi:     file format pei-x86-64

Sections:
Idx Name          Size      VMA               LMA               File off  Algn
  0 .text         00007a2b  0000000000004000  0000000000004000  00000400  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .reloc        0000000a  000000000000c000  000000000000c000  00008000  2**0
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .data         00002ea8  000000000000d000  000000000000d000  00008200  2**5
                  CONTENTS, ALLOC, LOAD, DATA
  3 .sbat         000000ec  0000000000010000  0000000000010000  0000b200  2**0
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  4 .dynamic      00000150  0000000000011000  0000000000011000  0000b400  2**3
                  CONTENTS, ALLOC, LOAD, DATA
  5 .rela         00000e70  0000000000012000  0000000000012000  0000b600  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  6 .rela.plt     00000018  0000000000012e70  0000000000012e70  0000c670  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  7 .dynsym       00000288  0000000000013000  0000000000013000  0000ca00  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, DATA

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https://bugs.launchpad.net/bugs/1921539

Title:
  Add support for SBAT

Status in OEM Priority Project:
  Confirmed
Status in fwupd package in Ubuntu:
  Fix Released
Status in fwupd-signed package in Ubuntu:
  Fix Released
Status in fwupd source package in Bionic:
  In Progress
Status in fwupd-signed source package in Bionic:
  In Progress
Status in fwupd source package in Focal:
  In Progress
Status in fwupd-signed source package in Focal:
  In Progress
Status in fwupd source package in Groovy:
  Fix Released
Status in fwupd-signed source package in Groovy:
  Fix Released
Status in fwupd source package in Hirsute:
  Fix Released
Status in fwupd-signed source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  Future releases of shim will require that EFI binaries that are chainloaded include an SBAT region.  fwupd in bionic does not currently contain this region.

  [Test Case]
  Verify that a shim that checks for sbat region can boot the fwupd with sbat region.

  [Regression Potential]
  This is moving to a new stable release in each of the series which is in bug fix only mode.  The sbat region is the only "feature" that has been backported to this series in over a year.

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