Change SkAutoTMalloc -> AutoTMalloc and move to skia_private

Change skia_internal -> skia_private which changes the namespace
for some tracing structures.

These changes are per the document:
https://docs.google.com/document/d/1zdT4ARUFaZCzEpFymD50QzsCeEyiL2NuK_VzNHbvhsg/edit?usp=sharing&resourcekey=0--uxQ4_t11LLrZVwb-Kisug

Change-Id: I4a629570d17b11129354cf1ab8d9750403801bf4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/629918
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
75 files changed