EFI updates for v6.9:

- Measure initrd and command line using the CC protocol if the ordinary
  TCG2 protocol is not implemented, typically on TDX confidential VMs

- Avoid creating mappings that are both writable and executable while
  running in the EFI boot services. This is a prerequisite for getting
  the x86 shim loader signed by MicroSoft again, which allows the
  distros to install on x86 PCs that ship with EFI secure boot enabled.

- API update for struct platform_driver::remove()
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