Revert "MLBEDSW-3645 4D class for op ifm/ofm shapes"

This reverts commit bf31d647dc5df47410ee577b12427ddf076d816b.

Reason for revert: <INSERT REASONING HERE>

Change-Id: I7b6c585b7658f94dbaa916c2b6bfe9fb463b8d37
diff --git a/ethosu/vela/high_level_command_to_npu_op.py b/ethosu/vela/high_level_command_to_npu_op.py
index 0711702..9380374 100644
--- a/ethosu/vela/high_level_command_to_npu_op.py
+++ b/ethosu/vela/high_level_command_to_npu_op.py
@@ -58,7 +58,6 @@
 from .register_command_stream_util import BASE_PTR_INDEX_MEM2MEM
 from .register_command_stream_util import to_npu_kernel
 from .register_command_stream_util import UNARY_ELEMWISE_OPS
-from .shape4d import Shape4D
 from .tensor import MemType
 from .tensor import Tensor
 from .tensor import TensorBlockTraversal
@@ -232,7 +231,7 @@
     return NpuQuantization(scale_f32=ofm_quant.scale_f32, zero_point=zero_point)
 
 
-def create_feature_map(tens: Tensor, box: Box, arch: ArchitectureFeatures, fm_shape: Shape4D) -> NpuFeatureMap:
+def create_feature_map(tens: Tensor, box: Box, arch: ArchitectureFeatures, fm_shape: List[int]) -> NpuFeatureMap:
     """Creates feature map with common fields populated"""
     fm = NpuFeatureMap()
     fm.region = get_region(tens, arch)