Fix fake SAI scheduler rate attrs

Summary:
Update fake SAI scheduler create handling so min/max bandwidth rate and burst
attributes read the u64 SAI attr union field. This matches the SAI trait types
and existing set/get behavior.

Reviewed By: daiwei1983, simuthus-fb

Differential Revision: D115315521

fbshipit-source-id: f3551aa1411003fb18e996bbd1614871e44f23dd

Author: Shrikrishna (Shri) Khare

fboss/agent/hw/sai/fake/FakeSaiScheduler.cpp

@@ -41,16 +41,16 @@ sai_status_t create_scheduler_fn(
         meterType = static_cast<sai_meter_type_t>(attr_list[i].value.s32);
         break;
       case SAI_SCHEDULER_ATTR_MIN_BANDWIDTH_RATE:
-        minBandwidthRate = attr_list[i].value.s32;
+        minBandwidthRate = attr_list[i].value.u64;
         break;
       case SAI_SCHEDULER_ATTR_MIN_BANDWIDTH_BURST_RATE:
-        minBandwidthBurstRate = attr_list[i].value.s32;
+        minBandwidthBurstRate = attr_list[i].value.u64;
         break;
       case SAI_SCHEDULER_ATTR_MAX_BANDWIDTH_RATE:
-        maxBandwidthRate = attr_list[i].value.s32;
+        maxBandwidthRate = attr_list[i].value.u64;
         break;
       case SAI_SCHEDULER_ATTR_MAX_BANDWIDTH_BURST_RATE:
-        maxBandwidthBurstRate = attr_list[i].value.s32;
+        maxBandwidthBurstRate = attr_list[i].value.u64;
         break;
       default:
         return SAI_STATUS_INVALID_PARAMETER;