RDMA/bnxt_re: Refactor hw context memory allocation

RDMA/bnxt_re: Refactor hw context memory allocation

This patch is in preparation for other patches in this series.
There is no functional changes intended.

1. Rename bnxt_qplib_alloc_ctx() to bnxt_qplib_alloc_hwctx().
2. Rename bnxt_qplib_free_ctx() to bnxt_qplib_free_hwctx().
3. Reduce the number of arguments of bnxt_qplib_alloc_hwctx()
   by moving a check outside of it.

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Link: https://patch.msgid.link/20250822040801.776196-4-kalesh-anakkur.purayil@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>