mtl/ofi: Remove special patch for gni provider

There should not be any Cray XC systems in production now
- which is where the GNI provider nominally functioned.

Meanwhile FI_MR_BASIC is deprecated since Libfabric 1.5
and will be droppped in future Libfabric 2.x versions.

Remove this special handler for gni provider due to
unnecessity and build warnings.

Signed-off-by: Shi Jin <sjina@amazon.com>

Author: shijin-aws

ompi/mca/mtl/ofi/mtl_ofi_component.c

@@ -982,17 +982,6 @@ ompi_mtl_ofi_component_init(bool enable_progress_threads,
         goto error;
     }
 
-    /**
-     * Unfortunately the attempt to implement FI_MR_SCALABLE in the GNI provider
-     * doesn't work, at least not well.  Since we're asking for the 1.5 libfabric
-     * API now, we have to tell GNI we want to use Mr. Basic.  Using FI_MR_BASIC
-     * rather than FI_MR_VIRT_ADDR | FI_MR_ALLOCATED | FI_MR_PROV_KEY to stay
-     * compatible with older libfabrics.
-     */
-    if (!strncmp(prov->fabric_attr->prov_name,"gni",3)) {
-         prov->domain_attr->mr_mode = FI_MR_BASIC;
-    }
-
     /**
      * Create the access domain, which is the physical or virtual network or
      * hardware port/collection of ports.  Returns a domain object that can be