Install kernel-headers as a separate target

Mark kernel-headers installation path as a separate target
so that other make files can add dependency on it to avoid
build issues arise because of missing headers.

Change-Id: I4fa44e9fa70847bf618a5c153fada2593d717228
Signed-off-by: Viswanath Kraleti <vkraleti@codeaurora.org>
1 file changed