vendor/cm: Point to proper prebuilts/cmsdk directories.

Change-Id: I80ac94fd9b2d3a80d91a82d65a260d26b1436e60
diff --git a/build/core/config.mk b/build/core/config.mk
index d948789..e798368 100644
--- a/build/core/config.mk
+++ b/build/core/config.mk
@@ -1,5 +1,5 @@
-CM_SRC_API_DIR := $(TOPDIR)vendor/cmsdk/api
-CM_SRC_SYSTEM_API_DIR := $(TOPDIR)vendor/cmsdk/system-api
+CM_SRC_API_DIR := $(TOPDIR)prebuilts/cmsdk/api
+CM_SRC_SYSTEM_API_DIR := $(TOPDIR)prebuilts/cmsdk/system-api
 INTERNAL_CM_PLATFORM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/cm_public_api.txt
 INTERNAL_CM_PLATFORM_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/cm_removed.txt
 INTERNAL_CM_PLATFORM_SYSTEM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/cm_system-api.txt