Pass context into the constructor of SystemUI objects.

The next step is to remove `components` from the SystemUI objects
and replace them with Dagger injection.

Bug: 138786270
Test: atest SystemUITests
Change-Id: I27415a8fa8ba0378599356426d849c9cfb9879d2
diff --git a/packages/SystemUI/proguard.flags b/packages/SystemUI/proguard.flags
index 22b0ab7..3e74970 100644
--- a/packages/SystemUI/proguard.flags
+++ b/packages/SystemUI/proguard.flags
@@ -35,3 +35,7 @@
     *;
 }
 -keep class androidx.core.app.CoreComponentFactory
+
+-keep public class * extends com.android.systemui.SystemUI {
+    public <init>(android.content.Context);
+}
\ No newline at end of file