[roll pigweed] pw_presubmit: Make "_2" and default calls match

Migrate from using these calls:

  build.gn_gen_2(ctx)

  build.cmake_2(ctx, *args)

To these calls:

  build.gn_gen(ctx)

  build.cmake(ctx, *args)

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/106951

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 63ed61f8f555886..cad987cd6edf7fc
Roller-URL: https://ci.chromium.org/b/8805552453233339553
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ifb59af2c64ecac6ba8f74affffedff78c0ee251d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107270
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>