TosaToTensor: Support reshape on unsigned

[mgehre-amd]

Update the conversion for tosa.reshape to properly use the type converter, so tosa.reshape on unsigned types work.

[cferry-AMD]

Is there an element-wise cast operator for tensors that would account for the unrealized casts? Besides, unless I'm mistaking, tensor reshaping should not depend on the element type, so I think I missed something here.

[mgehre-amd]

Is there an element-wise cast operator for tensors that would account for the unrealized casts? Besides, unless I'm mistaking, tensor reshaping should not depend on the element type, so I think I missed something here.

When converting from TOSA to linalg, we need to convert unsigned to signless integers. This is done via the type converted, but all RewritePatterns need to correctly use it to determine the destination types.
The one for tosa.reshape didn't do that, so it would create linalg IR with unsigned types.

The casts are unrealized casts because they are expected to fold away, and not be realized into actual operations like tensor.cast.

[cferry-AMD]

This looks OK from a technical standpoint. I don't want my absence of knowledge of TOSA-to-{Linalg,Tensor} to block you for the rest.

[TinaAMD]

LGTM