Switch the booter firmware loader from the legacy binary format to the
TLV format.  This change requires the new TLV versions of the r570.144
firmware images.

The new TLV format has all of the metadata needed by Nova encoded as
separate tags, eliminating the need to parse legacy firmware headers
such as HsHeaderV2 and HsSignatureParams.  All of the structs and
code for parsing those headers is therefore deleted.

Signed-off-by: Timur Tabi <ttabi@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20260731201017.2580713-5-ttabi@nvidia.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

TLV (type, length, value) files are the new image format used by Nova
to encapsulate firmware images and their metadata.  Unlike the firmware
files for previous versions of the firmware, TLV filenames are not
versioned, and they have a .tlv suffix.

Add function request_tlv() to load TLV firmware images.

Add the Tlv struct and supporting types for parsing TLV firmware images.
TLV files begin with a 4-byte magic header, which must be "NVFW" for
Nvidia firmware files.  This is followed by a sequence of blocks each
containing a 4-byte ASCII tag, a 4-byte little-endian length, and a
payload padded to a 4-byte boundary.

Tlv::new() validates the entire image up front, so that the iterator can
subsequently yield blocks without fallible parsing.

Also add accessor methods for the various encoded types that will be used
by the driver.

Signed-off-by: Timur Tabi <ttabi@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20260731201017.2580713-4-ttabi@nvidia.com
[ Drop unnecessary payload.is_empty() check in Tlv::new(), use EINVAL
  instead of ENODATA in Tlv::get_bytes() and add a corresponding TODO
  comment. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>