FAA is short for atomic fetch and add, not FAD. Fix this.

Fixes: 0ca9c2e2 ("RDMA/erdma: Implement atomic operations support")
Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230320084652.16807-2-chengyou@linux.alibaba.comSigned-off-by: Leon Romanovsky <leon@kernel.org>