[mlir][tosa] Fix tosa::Select to linalg::generic indexingMaps bug

The tosa to linalg generic ops indexingMaps rank use is wrong.
	 Find this bug in gpt2 pytorch model lowering to tosa.
	 issue link is here https://github.com/llvm/llvm-project/issues/58154

Reviewed By: jpienaar

Differential Revision: https://reviews.llvm.org/D135343