RDMA/irdma: Report the correct max cqes from query device

[ Upstream commit 12faad5e ]

Report the correct max cqes available to an application taking
into account a reserved entry to detect overflow.

Fixes: b48c24c2

 ("RDMA/irdma: Implement device supported verb APIs")
Signed-off-by: Sindhu-Devale <sindhu.devale@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Link: https://lore.kernel.org/r/20220906223244.1119-2-shiraz.saleem@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>