RDMA/irdma: Process extended CQ entries correctly

[ Upstream commit e93c7d8e ]

The valid bit for extended CQE's written by HW is retrieved from the
incorrect quad-word. This leads to missed completions for any UD traffic
particularly after a wrap-around.

Get the valid bit for extended CQE's from the correct quad-word in the
descriptor.

Fixes: 551c46ed

 ("RDMA/irdma: Add user/kernel shared libraries")
Link: https://lore.kernel.org/r/20211005182302.374-1-shiraz.saleem@intel.com
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>