[MLIR] Make the implementations for getMixedOffsets/Sizes/Strides independent...

[MLIR] Make the implementations for getMixedOffsets/Sizes/Strides independent of OffsetSizeAndStrideOpInterface

The functions are effectively independent of the interface already, however, they take it as an argument for no reason.
The current state complicates reuse outside of MLIR.

Differential Revision: https://reviews.llvm.org/D131120