Remove dependency to real NotoColorEmoji.ttf.

NotoColorEmoji.ttf has 'by-exception-only' license and should not have
been depended by vts.
This CL swaps it with a fake NotoColorEmoji.ttf font.
testdata/NotoColorEmoji.ttx is based on
cts/tests/tests/text/assets/fonts/samplefont.ttx

Bug: 191914223
Test: atest UpdatableSystemFontTest
Change-Id: If5f57471b492cae1eb35f6d4a4ac0054270b23a3
diff --git a/tests/UpdatableSystemFontTest/testdata/Android.bp b/tests/UpdatableSystemFontTest/testdata/Android.bp
index 0f01be0..426464e 100644
--- a/tests/UpdatableSystemFontTest/testdata/Android.bp
+++ b/tests/UpdatableSystemFontTest/testdata/Android.bp
@@ -21,6 +21,13 @@
     default_applicable_licenses: ["frameworks_base_license"],
 }
 
+// An existing module name is reused to avoid merge conflicts.
+// TODO: fix the font and module name.
+filegroup {
+    name: "NotoColorEmojiTtf",
+    srcs: ["NotoColorEmoji.ttf"],
+}
+
 filegroup {
     name: "UpdatableSystemFontTestKeyPem",
     srcs: ["UpdatableSystemFontTestKey.pem"],