COMPMID-1639: Add GenerateProposals to the graph API

Change-Id: Icf813a0a87d4a07e180eafdb5fa916b2ea4028d2
diff --git a/src/graph/backends/CL/CLNodeValidator.cpp b/src/graph/backends/CL/CLNodeValidator.cpp
index 2a3121f..9cbf4bb 100644
--- a/src/graph/backends/CL/CLNodeValidator.cpp
+++ b/src/graph/backends/CL/CLNodeValidator.cpp
@@ -59,6 +59,8 @@
         case NodeType::DepthwiseConvolutionLayer:
             return detail::validate_depthwise_convolution_layer<CLDepthwiseConvolutionLayer,
                    CLDepthwiseConvolutionLayer3x3>(*polymorphic_downcast<DepthwiseConvolutionLayerNode *>(node));
+        case NodeType::GenerateProposalsLayer:
+            return detail::validate_generate_proposals_layer<CLGenerateProposalsLayer>(*polymorphic_downcast<GenerateProposalsLayerNode *>(node));
         case NodeType::NormalizePlanarYUVLayer:
             return detail::validate_normalize_planar_yuv_layer<CLNormalizePlanarYUVLayer>(*polymorphic_downcast<NormalizePlanarYUVLayerNode *>(node));
         case NodeType::PadLayer: