Arm backend: Remove redundant validation check for op_where (#10773)

Signed-off-by: Sebastian Larsson <[email protected]>

Author: Sebastian-Larsson

backends/arm/operators/op_where.py

@@ -69,8 +69,6 @@ def define_node(
     ) -> None:
         import tosa_tools.v0_80.serializer.tosa_serializer as ts  # type: ignore
 
-        validate_num_inputs(self.target, inputs, 3)
-
         bi_supported_dtypes = [
             ts.DType.INT8,
             ts.DType.INT16,
@@ -99,8 +97,6 @@ def define_node(
     ) -> None:
         import tosa_tools.v0_80.serializer.tosa_serializer as ts  # type: ignore
 
-        validate_num_inputs(self.target, inputs, 3)
-
         mi_supported_dtypes = [
             ts.DType.FP16,
             ts.DType.FP32,
@@ -163,8 +159,6 @@ def define_node(
     ) -> None:
         import serializer.tosa_serializer as ts
 
-        validate_num_inputs(self.target, inputs, 3)
-
         bi_supported_dtypes = [
             ts.DType.INT8,
             ts.DType.INT16,
@@ -193,8 +187,6 @@ def define_node(
     ) -> None:
         import serializer.tosa_serializer as ts
 
-        validate_num_inputs(self.target, inputs, 3)
-
         mi_supported_dtypes = [
             ts.DType.FP16,
             ts.DType.FP32,