RDMA/bnxt_re: Add support for QP rate limiting

RDMA/bnxt_re: Add support for QP rate limiting

Broadcom P7 chips supports applying rate limit to RC QPs.
It allows adjust shaper rate values during the INIT -> RTR,
RTR -> RTS, RTS -> RTS state changes or after QP transitions
to RTR or RTS.

Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Reviewed-by: Hongguang Gao <hongguang.gao@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Link: https://patch.msgid.link/20260202133413.3182578-2-kalesh-anakkur.purayil@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>