[roll] Roll fuchsia [aml-g12-tdm] Use SDK pdev library

Make the aml-g12-tdm and aml-g12-tdm-dai driver use the
//sdk/lib/driver/platform-device/cpp SDK library in order to interact
with the platform device.

Refactor the GN targets of the drivers and their tests in order to avoid
specifying duplicate dependencies.

Original-Bug: 366517646
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1239285
Original-Revision: 275970b012f0f8299b36cc125a73ab800d9318ec
GitOrigin-RevId: e761da0ee582b65ecf878730c80506a305b7bc63
Change-Id: I268a9f46028e9a70f4b9fb6bb6e8aedad540b09e
diff --git a/stem b/stem
index bc54c7d..ece8769 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="16e1f8f59150604a4d4b053760aaeb978748bfb5"/>
+             revision="275970b012f0f8299b36cc125a73ab800d9318ec"/>
   </projects>
   <hooks>
     <hook name="install-environment"