Export aidl files for framework

Export the aidl files for framework so that anything building
against the framework automatically gets the default aidl
includes.

Test: m checkbuild
Change-Id: I26c599c79babd8ac91340a4e9d2c75d3f211f776
diff --git a/Android.bp b/Android.bp
index b0493aa..2185e05 100644
--- a/Android.bp
+++ b/Android.bp
@@ -534,7 +534,7 @@
     ],
 
     aidl: {
-        local_include_dirs: [
+        export_include_dirs: [
             // From build/make/core/pathmap.mk FRAMEWORK_BASE_SUBDIRS
             "core/java",
             "graphics/java",