Update git submodules

* Update frameworks/support from branch 'androidx-main'
  to 6d4c8a73db3f05daca142904394afb1b00a3e95d
  - Merge "API Council feedback for Hierarchical Focus Coordinator (HFC)" into androidx-main
  - API Council feedback for Hierarchical Focus Coordinator (HFC)
    
    Kdocs & comments improvements.
    Test: No code changes.
    Relnote: Docs improvements.
    Bug: 360919765
    
    Change-Id: Idf2fff47b1ba1164e4c36ec108f6a897f492cd6b
    
diff --git a/frameworks/support b/frameworks/support
index d9c5d25..6d4c8a7 160000
--- a/frameworks/support
+++ b/frameworks/support
@@ -1 +1 @@
-Subproject commit d9c5d25e2ed551e6306f66298ff602c5d5f8bad0
+Subproject commit 6d4c8a73db3f05daca142904394afb1b00a3e95d