lkdtm: Add case to provoke a crash in EFI runtime services

Add a lkdtm test case that triggers a fault during the execution of a
EFI runtime service by passing a read-only variable as a by-ref argument
that the firmware is supposed to update.

This is useful for testing the graceful handling of faults/exception in
EFI platform firmware, which is implemented on x86 and arm64.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260501170156.2833364-2-ardb+git@google.com
Signed-off-by: Kees Cook <kees@kernel.org>

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