Move librilutils to vendor.

Test: CleanSpec.mk works
Test: Works with BOARD_VNDK_VERSION := current
Test: Phone call works
Fixes: 37429672
Merged-In: I605732a88dc57132d8fa4bbfa70a3c9b47b0e0ff
Change-Id: I605732a88dc57132d8fa4bbfa70a3c9b47b0e0ff
(cherry picked from commit 4ef3e136c440153bb1173457f64bec9f2fecb81e)
diff --git a/CleanSpec.mk b/CleanSpec.mk
index ffa18d5..cca8c69 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -52,3 +52,5 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/etc/init/rild.rc)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib/libril.so)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib64/libril.so)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib/librilutils.so)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib64/librilutils.so)