Update mts tags on Apis used in documentsUi to mts-documentsui

Bug: 203466102
Test: built locally and verified contents
Change-Id: Ifd32cb4246a156794122dfba2c0f45e1d18355be
diff --git a/tests/tests/content/Android.bp b/tests/tests/content/Android.bp
index 9ada51d..b78ccbe 100644
--- a/tests/tests/content/Android.bp
+++ b/tests/tests/content/Android.bp
@@ -107,7 +107,7 @@
     test_suites: [
         "cts",
         "general-tests",
-        "mts",
+        "mts-documentsui",
     ],
     min_sdk_version: "29",
 }
diff --git a/tests/tests/provider/Android.bp b/tests/tests/provider/Android.bp
index c979102..91566e3 100644
--- a/tests/tests/provider/Android.bp
+++ b/tests/tests/provider/Android.bp
@@ -13,7 +13,7 @@
         "cts",
         "general-tests",
         "sts",
-        "mts",
+        "mts-documentsui",
     ],
 
     libs: [