TOSA: Added RESHAPE, SLICE and CONCAT

Added support for Data layout ops
RESHAPE, SLICE and CONCAT.
-No support for bool_t
-Support limited to Rank <= 4 and N = 1

Signed-off-by: Patrik Gustavsson <patrik.gustavsson@arm.com>
Change-Id: I487ac494b6506a2a6ba947ee758aa193194dd796
diff --git a/ethosu/vela/tosa_reader.py b/ethosu/vela/tosa_reader.py
index 2925ab4..94ba350 100644
--- a/ethosu/vela/tosa_reader.py
+++ b/ethosu/vela/tosa_reader.py
@@ -29,6 +29,7 @@
 from .reader_util import clone_and_reshape_tensor
 from .reader_util import decode_str
 from .reader_util import fixup_tensors
+from .shape4d import Shape4D
 from .tensor import QuantizationParameters
 from .tensor import shape_num_elements
 from .tensor import Tensor
@@ -186,6 +187,9 @@
                     op.rescale = [1, shift]
             if op.type.is_depthwise_conv2d_op():
                 op.attrs["depth_multiplier"] = op.weights.shape[3]
+            if op.type == Op.SplitSliceRead:
+                op.read_offsets[0] = Shape4D.from_list(list(op.attrs["begin"]), 0)
+                op.read_shapes[0] = op.attrs["size"]
 
         elif op.type == Op.Transpose:
             op.attrs["perms"] = perms.values