[mlir][tosa] Add uint16 to TOSA type support

[rsuderman]

Summary

UInt16 is included as a required TOSA type for basic
operations. Added support as a TOSA Tensor.

[AmosLewis]

I find in the TOSA dialect definition, there is Tosa_Int64 support. Is there any specific reason that we cannot add F64 in TOSA ? Just at:
https://github.com/llvm/llvm-project/blob/9dea83d4af0b532373f8a0384ce7a873ebf18e41/mlir/include/mlir/Dialect/Tosa/IR/TosaTypesBase.td#L88

mlir/include/mlir/Dialect/Tosa/IR/TosaTypesBase.td

 }
 
 //===----------------------------------------------------------------------===//
 // Non-Quantized Signed Integer Types.
 // Used to express accumulator results or compare results.
 //===----------------------------------------------------------------------===//
 
 def Tosa_UInt8 : UI<8>;
+def Tosa_UInt16 : UI<16>;
 
 def Tosa_Int8 : I<8>;
 def Tosa_Int16 : I<16>;
 def Tosa_Int32 : I<32>;
 def Tosa_Int48 : I<48>;
 def Tosa_Int64 : I<64>;
 
 def Tosa_SignedInt : AnyTypeOf<[Tosa_Int8,
                                 Tosa_Int16,
                                 Tosa_Int32,
                                 Tosa_Int48,
                                 Tosa_Int64]>;
 
 def Tosa_Bool : I<1>;
 
 // No unsigned unquantized int types.
 def Tosa_Int : AnyTypeOf<[Tosa_Bool,
                           Tosa_UInt8,
+                          Tosa_UInt16,
                           Tosa_SignedInt]>;
 
 def Tosa_Int32Or64 : AnyTypeOf<[Tosa_Int32,
                             Tosa_Int64]>;
 
 //===----------------------------------------------------------------------===//
 // Quantized Integer Types.
 // Datatype for network feature map or weight content.