Add minApiLevel 30 argument to stats-log-api-gen

Add minApiLevel 30 argument to stats-log-api-gen to maintain
backwards compatibility with R in the next Android release.

Bug: 160938178
Test: m statslog-textclassifier-java-gen
Test: inspect generated TextClassifierStatsLog
Change-Id: Ic3fef461ca70795f02ae3eb2ef6c5ad34d1b6a4e
diff --git a/java/Android.bp b/java/Android.bp
index 893b423..3f73fda 100644
--- a/java/Android.bp
+++ b/java/Android.bp
@@ -66,6 +66,8 @@
 genrule {
     name: "statslog-textclassifier-java-gen",
     tools: ["stats-log-api-gen"],
-    cmd: "$(location stats-log-api-gen) --java $(out) --module textclassifier --javaPackage com.android.textclassifier.common.statsd --javaClass TextClassifierStatsLog",
+    cmd: "$(location stats-log-api-gen) --java $(out) --module textclassifier" +
+         " --javaPackage com.android.textclassifier.common.statsd" +
+         " --javaClass TextClassifierStatsLog --minApiLevel 30",
     out: ["com/android/textclassifier/common/statsd/TextClassifierStatsLog.java"],
 }