Fix android-support-v17-leanback-docs build.
Fix android-support-v17-leanback-docs build.

To include the generated R.java, you need to add
android-support-v17-leanback-res's intermediate dir to
LOCAL_ADDITIONAL_JAVA_DIR, not android-support-v17-leanback's.

Bug: 19842418
Change-Id: I5854f1579f4417a9045da04443c70f2e95d86360

AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,aosp-mirror/platform_frameworks_support,androidx/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx