statsd: Set min_sdk_version to "30"

Just a cosmetic cleanup since "R" resolves to 30 as well.

Test: m
Bug: 171330443
Change-Id: I6c6785b93f64a89633fcc7e64116d7a2f4578d2a

apex/statsd/Android.bp

@@ -35,7 +35,7 @@ apex_defaults {
     prebuilts: ["com.android.os.statsd.init.rc"],
     name: "com.android.os.statsd-defaults",
     updatable: true,
-    min_sdk_version: "R",
+    min_sdk_version: "30",
     key: "com.android.os.statsd.key",
     certificate: ":com.android.os.statsd.certificate",
 }