get kernel configs from kernel/configs

The kernel configs have moved out of VTS and into their own
repository.

Test: build and boot
Change-Id: I649af63216e7b18604586f70396bceff626c30d0
diff --git a/target/board/Android.mk b/target/board/Android.mk
index 5504c52..c5678d1 100644
--- a/target/board/Android.mk
+++ b/target/board/Android.mk
@@ -132,7 +132,7 @@
 
 # All kernel versions that the system image works with.
 KERNEL_VERSIONS := 3.18 4.4 4.9
-KERNEL_CONFIG_DATA := test/vts-testcase/kernel/config/data
+KERNEL_CONFIG_DATA := kernel/configs
 
 $(GEN): $(foreach version,$(KERNEL_VERSIONS),\
 	$(wildcard $(KERNEL_CONFIG_DATA)/android-$(version)/android-base*.cfg))