Add API signature files for the system server APIs

... so that they can be reviewed.

Bug: 140202860
Test: m

Exempt-From-Owner-Approval: cherry-pick from internal

Merged-In: Iec8cdd30ad5e4979d56140a8c00a85af6476f67f
(cherry picked from commit 13c923d00a8a605db7aecac7456ecfdd08d18759)
Change-Id: Iec8cdd30ad5e4979d56140a8c00a85af6476f67f
diff --git a/services/Android.bp b/services/Android.bp
index 53d792d..80452f1 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -121,6 +121,12 @@
         "framework-all",
     ],
     visibility: ["//visibility:private"],
+    check_api: {
+        current: {
+            api_file: "api/current.txt",
+            removed_api_file: "api/removed.txt",
+        },
+    },
 }
 
 java_library {