Delete unneeded filegroup

The libui_host_common file group was created to be able to include
certain files from libui into a host build without having to make the
entire library host compatible. This is exactly what libui-types has
done, so that can be used instead of this filegroup.

Bug: 322360037
Test: build libhostgraphics
Change-Id: I6b347980d393b48afddfc97058ab189811e2e640
diff --git a/libs/ui/Android.bp b/libs/ui/Android.bp
index 312a1e6..12230f9 100644
--- a/libs/ui/Android.bp
+++ b/libs/ui/Android.bp
@@ -277,13 +277,3 @@
     "tests",
     "tools",
 ]
-
-filegroup {
-    name: "libui_host_common",
-    srcs: [
-        "Rect.cpp",
-        "Region.cpp",
-        "PixelFormat.cpp",
-        "Transform.cpp",
-    ],
-}