Since the function irdma_set_hw_rsrc always returns zero, change the
returned type to void and remove all the related source code.

Link: https://lore.kernel.org/r/20210714031130.1511109-3-yanjun.zhu@linux.devSigned-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>