Move testutils to androidx.testutils package.

Test: ./gradlew assembleDebug
Change-Id: Ib6347167e152e043c47ffb91194d666000a1677a
diff --git a/settings.gradle b/settings.gradle
index 06b1c32..5e1b188 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -127,7 +127,7 @@
 //
 /////////////////////////////
 
-includeProject(":support-testutils", "testutils")
+includeProject(":internal-testutils", "testutils")
 
 /////////////////////////////
 //