Simplify offset and address calculation

[yongwonshin]

Motivation

• Address calculation and offset logic are quite complex to understand.
• Some transformed thread indices (w_idx, gidx, offset) are to help address mapping, which unnecessarily complicates the code.

Key changes

• I created addr_gen_s utility function which accepts any offset and column value.
• Address (in-bank offset) calculation is now flattened following the CUDA convention.

Test

• All pass OpenCLPimIntegrationTests.

To Reviewers

• Test passed using OpenCL and NVIDIA GPU, but I'm not sure it would pass in the real PIM hardware.
• addr_gen_s calls addr_gen_ which adds slight overhead.