Replace usage of SkTClamp with SkTPin

I prefer the SkTClamp spelling, but there were 4 uses vs. ~200. And
eventually we'll replace all of these with std::clamp anyway.

Change-Id: I418fce5080d089745c3f9eb42c36e3fc7962c895
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/269155
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 2f50058..66d541f 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -7,7 +7,7 @@
 Milestone 82
 
 <Insert new notes here- top is most recent.>
-  * Removed SkClampMax.
+  * Removed SkTClamp and SkClampMax.
   * Removed SkScalarClampMax and SkScalarPin.
   * Removed SkMax32 and SkMin32.
   * Removed SkMaxScalar and SkMinScalar.