habanalabs: remove some f/w descriptor validations

To be forward-backward compatible with the firmware in the initial
communication during preboot, we need to remove the validation of the
header size. This will allow us to add more fields to the
lkd_fw_comms_desc structure.

Instead of the validation of the header size, we just print warning
when some mismatch in descriptor has been revealed, and we calculate
the CRC base on descriptor size reported by the firmware instead of
calculating it ourselves.

Signed-off-by: farah kassabri <fkassabri@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>