RDMA/bnxt_re: Congestion control settings using debugfs hook

RDMA/bnxt_re: Congestion control settings using debugfs hook

Implements routines to set and get different settings  of
the congestion control. This will enable the users to modify
the settings according to their network.

Currently supporting only GEN 0 version of the parameters.
Reading these files queries the firmware and report the values
currently programmed. Writing to the files sends commands that
update the congestion control settings

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1737301535-6599-1-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>