AndroidKernel: add TARGET_PREBUILT_INT_KERNEL_IMAGE

Add TARGET_PREBUILT_INT_KERNEL_IMAGE to support compile modules to
dependence on Image.

Change-Id: If8f5825c3028fc8cd304cf745bcf68a6b2d28ec4
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>
Signed-off-by: Cong Zhang <congzhan@codeaurora.org>