Graphics: Migrate graphics.common HAL to version 6

- Update defaults to V6 instead of V5
- Update older dependent HALs to also reference V6

Test: Builds
Flag: EXEMPT build change
Bug: 368395888
Change-Id: I542c1c638b9d63c2510b11d04d6ed98477780af7
diff --git a/graphics/allocator/aidl/Android.bp b/graphics/allocator/aidl/Android.bp
index 30b341c..3f74b23 100644
--- a/graphics/allocator/aidl/Android.bp
+++ b/graphics/allocator/aidl/Android.bp
@@ -45,7 +45,7 @@
             version: "2",
             imports: [
                 "android.hardware.common-V2",
-                "android.hardware.graphics.common-V5",
+                "android.hardware.graphics.common-V6",
             ],
         },