pw_stream_uart_mcuxpresso: DMA stream example This change introduces a new dma stream example that compiles by itself to ensure that the build environment provides all the expected headers. As part of the validation I had to fix up a few compiler issues that don't show up when compiling the module with bazel. I have also decided to directly integrate the example code from the source file, so that we know that it is compiling correctly. Test: w presubmit --step=gn_mimxrt595_freertos_build Test: w presubmit --step=gn_mimxrt595_build Bug: 343773769 Change-Id: If11eb112fe275a5576a82c19f43c65daa430ede7 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/212391 Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com> Reviewed-by: Austin Foxley <afoxley@google.com> Commit-Queue: Christoph Klee <chklee@google.com>
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