[VOL-4371]  Voltha protos cleanup

Details can be found at:
https://docs.google.com/document/d/1UzfuiPzxYYTULyERk8nKfgzW9QAnwEdtfw_J4UoFyYo/edit

Change-Id: Iad2efddf306234e282af5d518fd435a6b50b1c41
diff --git a/protos/voltha_protos/onu_inter_adapter_service.proto b/protos/voltha_protos/onu_inter_adapter_service.proto
new file mode 100755
index 0000000..ee4dff7
--- /dev/null
+++ b/protos/voltha_protos/onu_inter_adapter_service.proto
@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-protos/v5/go/onu_inter_adapter_service";
+option java_package = "org.opencord.voltha.onu_inter_adapter_service";
+option java_outer_classname = "VolthaOnuInterAdapterService";
+
+package onu_inter_adapter_service;
+
+import "google/protobuf/empty.proto";
+import "voltha_protos/inter_adapter.proto";
+import "voltha_protos/health.proto";
+
+service OnuInterAdapterService {
+    // GetHealthStatus is used by an OnuInterAdapterService client to verify connectivity
+    // to the gRPC server hosting the OnuInterAdapterService service
+    rpc GetHealthStatus(google.protobuf.Empty) returns (health.HealthStatus);
+
+    rpc OnuIndication(inter_adapter.OnuIndicationMessage) returns (google.protobuf.Empty);
+    rpc OmciIndication(inter_adapter.OmciMessage) returns (google.protobuf.Empty);
+    rpc DownloadTechProfile(inter_adapter.TechProfileDownloadMessage) returns (google.protobuf.Empty);
+    rpc DeleteGemPort(inter_adapter.DeleteGemPortMessage) returns (google.protobuf.Empty);
+    rpc DeleteTCont(inter_adapter.DeleteTcontMessage) returns (google.protobuf.Empty);
+}
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