Include additional requirements to build kernel

The Makefile changes in kernel requires additional flags and a
config file. Include all the necessary requirements here.

Change-Id: Ie5256d8b88f4c47c7ff4230d299f202a90000687
diff --git a/AndroidBoard.mk b/AndroidBoard.mk
index d26dce7..9bf2008 100644
--- a/AndroidBoard.mk
+++ b/AndroidBoard.mk
@@ -13,6 +13,9 @@
 endif
 endif
 
+TARGET_KERNEL_SOURCE := kernel/msm8974
+BOARD_KERNEL_IMAGE_NAME := zImage
+
 include kernel/msm8974/AndroidKernel.mk
 
 $(INSTALLED_KERNEL_TARGET): $(TARGET_PREBUILT_KERNEL) | $(ACP)