Move RingBuffer to SystemUICommon.

This change adds a new module SystemUICommon and moves RingBuffer to
it. This is to prepare introducing a new logging library which would
depend on it.

Bug: 276475093
Test: RingBuffer does not have existing tests, so just verified
LogBuffer works correctly on device

Change-Id: Ib71fcf8526021be1ac3fe279210c54cb7d4cd0e6
diff --git a/packages/SystemUI/Android.bp b/packages/SystemUI/Android.bp
index 3007d4a..7a1d9a3 100644
--- a/packages/SystemUI/Android.bp
+++ b/packages/SystemUI/Android.bp
@@ -156,9 +156,10 @@
         "WifiTrackerLib",
         "WindowManager-Shell",
         "SystemUIAnimationLib",
+        "SystemUICommon",
+        "SystemUICustomizationLib",
         "SystemUIPluginLib",
         "SystemUISharedLib",
-        "SystemUICustomizationLib",
         "SystemUI-statsd",
         "SettingsLib",
         "androidx.core_core-ktx",