Expose ulocdata_getCLDRVersion from NDK

ulocdata_getCLDRVersion returns the CLDR version from
the data. We have exposed it in ICU4J via LocaleData API,
but this C function is needed by libcore/ART to setup the runtime.

Bug: 139480281
Bug: 160350521
Test: m droid
Change-Id: I2a153f2d2445b2445f7c4be678742a994016bf63
diff --git a/libicu/libicu.map.txt b/libicu/libicu.map.txt
index 12f30b6..3098a69 100644
--- a/libicu/libicu.map.txt
+++ b/libicu/libicu.map.txt
@@ -160,6 +160,7 @@
     uloc_toLegacyType;
     uloc_toUnicodeLocaleKey;
     uloc_toUnicodeLocaleType;
+    ulocdata_getCLDRVersion;
   local:
     *;
 };
\ No newline at end of file