iommufd: Apply obvious cosmetic fixes

iommufd: Apply obvious cosmetic fixes

Run clang-format but exclude those not so obvious ones, which leaves us:
 - Align indentations
 - Add missing spaces
 - Remove unnecessary spaces
 - Remove unnecessary line wrappings

Link: https://patch.msgid.link/r/9132e1ab45690ab1959c66bbb51ac5536a635388.1749882255.git.nicolinc@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>