[MIGraphX EP] Link FP4 types between OnnxRT and MIGraphX APIs (#26231)

Do this so that MIGraphX can take in fp4 types from input/output tensors
and then use that to perform an inference via the MIGraphX API.

### Description
<!-- Describe your changes. -->
Mirroed changes going into ROCm 7.1 build. Cherry -picked mainline
OnnxRT changes to get fp4 tensor support before adding this ontop.

Moving this to mainline OnnxRt to enable the MIGraphX EP to allow for
fp4 input/output tensors
ROCm#176

### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Add fp4 support to MIGraphX EP

Author: TedThemistokleous

onnxruntime/core/providers/migraphx/migraphx_execution_provider.cc

@@ -268,6 +268,7 @@ static bool IsTypeSupported(const NodeArg* node_arg) {
     case ONNX_NAMESPACE::TensorProto_DataType::TensorProto_DataType_FLOAT16:
     case ONNX_NAMESPACE::TensorProto_DataType::TensorProto_DataType_BFLOAT16:
     case ONNX_NAMESPACE::TensorProto_DataType::TensorProto_DataType_FLOAT:
+    case ONNX_NAMESPACE::TensorProto_DataType::TensorProto_DataType_FLOAT4E2M1:
     case ONNX_NAMESPACE::TensorProto_DataType::TensorProto_DataType_FLOAT8E4M3FN:
     case ONNX_NAMESPACE::TensorProto_DataType::TensorProto_DataType_FLOAT8E4M3FNUZ:
     case ONNX_NAMESPACE::TensorProto_DataType::TensorProto_DataType_FLOAT8E5M2:
@@ -318,6 +319,9 @@ static bool getMIGraphXType(ONNXTensorElementDataType type,
     case ONNX_TENSOR_ELEMENT_DATA_TYPE_FLOAT8E5M2FNUZ:
       mgx_type = migraphx_shape_fp8e5m2fnuz_type;
       break;
+    case ONNX_TENSOR_ELEMENT_DATA_TYPE_FLOAT4E2M1:
+      mgx_type = migraphx_shape_fp4x2_type;
+      break;
     case ONNX_TENSOR_ELEMENT_DATA_TYPE_INT4:
       mgx_type = migraphx_shape_int8_type;
       break;