Add documentation for the efi_secret module which allows access
to Confidential Computing injected secrets.
Signed-off-by: NDov Murik <dovmurik@linux.ibm.com>
Reviewed-by: NGerd Hoffmann <kraxel@redhat.com>
Link: https://lore.kernel.org/r/20220412212127.154182-5-dovmurik@linux.ibm.comSigned-off-by: NArd Biesheuvel <ardb@kernel.org>