MiraclePtr: Add raw_ptr definitions

Add "raw_ptr_noop" target, where Skia provides a "no-op" implementation
of PartitionAlloc of "raw_ptr". They are used when PartitionAlloc is
disabled.

Bug: 351867706
Change-Id: If733b7105a20236bf86c0a203b79af6bd687c6cf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1112096
Auto-Submit: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Kaylee Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>