Add missing transitive dependencies

Add android-support-v7-palette to SystemUI for
android-support-v7-mediarouter

Test: m -j ANDROID_COMPILE_WITH_JACK=false checkbuild
Change-Id: I6aa18380fa338a01f73381ab0a3259ff94173ce1
diff --git a/packages/SystemUI/Android.mk b/packages/SystemUI/Android.mk
index 53c5b1b..5ee0c64 100644
--- a/packages/SystemUI/Android.mk
+++ b/packages/SystemUI/Android.mk
@@ -35,6 +35,7 @@
     android-support-v7-preference \
     android-support-v7-appcompat \
     android-support-v7-mediarouter \
+    android-support-v7-palette \
     android-support-v14-preference \
     android-support-v17-leanback