Rename android_icu4j_src_files filegroup

Rename the filegroup to indicate it contains only subset for public
APIs.

Bug: 142690826
Test: m droid
Change-Id: If128c5a873899ab037ab78637180f9f9083cf890
diff --git a/JavaLibrary.bp b/JavaLibrary.bp
index afba8e9..395c966 100644
--- a/JavaLibrary.bp
+++ b/JavaLibrary.bp
@@ -120,7 +120,7 @@
         "//frameworks/base",
     ],
     srcs: [
-        ":android_icu4j_src_files",
+        ":android_icu4j_public_api_files",
         ":core_oj_api_files",
         ":core_libart_api_files",
         ":conscrypt_public_api_files",