Null annotations for java.lang.(Character|Byte)

Annotated Integer.java can be found at
out/target/common/obj/JAVA_LIBRARIES/core-oj_intermediates/
annotated/java/lang/(Character|Byte).java

+ Updated generate_annotated_java_files.py to correctly handle
nested classes.

Test: make docs
Bug: 64930165
Change-Id: Icda613b60a406f0bc5e127a12e0916ddd6542d04
diff --git a/annotated_java_files.bp b/annotated_java_files.bp
index e9d2a0f..fe9c4c7 100644
--- a/annotated_java_files.bp
+++ b/annotated_java_files.bp
@@ -3,7 +3,9 @@
     name: "annotated_ojluni_files",
     export_to_make_var: "annotated_ojluni_files",
     srcs: [
+        "ojluni/src/main/java/java/lang/Byte.java",
         "ojluni/src/main/java/java/lang/CharSequence.java",
+        "ojluni/src/main/java/java/lang/Character.java",
         "ojluni/src/main/java/java/lang/Double.java",
         "ojluni/src/main/java/java/lang/Enum.java",
         "ojluni/src/main/java/java/lang/Float.java",