RDMA/bnxt_re: Refactor the BNXT_RE_METHOD_GET_TOGGLE_MEM method

Refactor the code in this function to have common code.
This is used in subsequent patches.

Signed-off-by: Chandramohan Akula <chandramohan.akula@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1724945645-14989-3-git-send-email-selvin.xavier@broadcom.com


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