Add generic Kbuild files for 'make headers_install'

This adds the Kbuild files listing the files which are to be installed by
the 'headers_install' make target, in generic directories.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/include/Kbuild b/include/Kbuild
new file mode 100644
index 0000000..cb25348
--- /dev/null
+++ b/include/Kbuild
@@ -0,0 +1,2 @@
+header-y += asm-generic/ linux/ scsi/ sound/ mtd/ rdma/ video/
+header-y += asm-$(ARCH)/