Adds float16 support for RANDOM_MULTINOMIAL.

Bug: 118607845
Test: VtsHalNeuralnetworksV1_2TargetTest --hal_service_instance=android.hardware.neuralnetworks@1.2::IDevice/sample-all
Change-Id: Iac8c0c23a8219702697a7a126e5e2e43ef0461f4
diff --git a/neuralnetworks/1.2/vts/functional/ValidateModel.cpp b/neuralnetworks/1.2/vts/functional/ValidateModel.cpp
index 294415b..562ac33 100644
--- a/neuralnetworks/1.2/vts/functional/ValidateModel.cpp
+++ b/neuralnetworks/1.2/vts/functional/ValidateModel.cpp
@@ -304,6 +304,7 @@
         // - ARGMIN and ARGMAX's first argument can be any of
         // TENSOR_(FLOAT16|FLOAT32|INT32|QUANT8_ASYMM).
         // - CAST's argument can be any of TENSOR_(FLOAT16|FLOAT32|INT32|QUANT8_ASYMM).
+        // - RANDOM_MULTINOMIAL's argument can be either TENSOR_FLOAT16 or TENSOR_FLOAT32.
         switch (operation.type) {
             case OperationType::LSH_PROJECTION: {
                 if (operand == operation.inputs[1]) {
@@ -318,6 +319,11 @@
                     return true;
                 }
             } break;
+            case OperationType::RANDOM_MULTINOMIAL: {
+                if (type == OperandType::TENSOR_FLOAT16 || type == OperandType::TENSOR_FLOAT32) {
+                    return true;
+                }
+            } break;
             default:
                 break;
         }