RDMA/bnxt_re: RoCE slow path TLV support

Header file to support  TLV encapsulated commands. These
functions will be used by the driver in the follow up patches.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1680169540-10029-6-git-send-email-selvin.xavier@broadcom.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>