[mlir][tosa] Support unranked input/weight tensors for convolution ops (#134856) This commit ensures that convolution operators including: conv2d, depthwise_conv2d, transpose_conv2d and conv3d, can have unranked input/weight operands. In order to support operands with unranked tensors, the tablegen definition was relaxed. The relaxation of tensor type will later be checked by the validation pass, should the user wish to use it. Signed-off-by: Luke Hutton <luke.hutton@arm.com>
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