Add soong namespace to sysui libs

Also, move compile-time constant to new library

Test: m checkbuild
Flag: NONE
Bug: 214238812
Change-Id: I9222a609021ba2c647a9ec59e4a62b7f30eba7b5
diff --git a/packages/SettingsLib/Android.bp b/packages/SettingsLib/Android.bp
index 66fad36..0b36757 100644
--- a/packages/SettingsLib/Android.bp
+++ b/packages/SettingsLib/Android.bp
@@ -22,7 +22,7 @@
         "guava",
 
         "WifiTrackerLibRes",
-        "iconloader",
+        "//frameworks/libs/systemui:iconloader",
         "setupdesign",
 
         "SettingsLibActionBarShadow",