UBUNTU: SAUCE: (no-up) re-add ubuntu/ directory

In the previous Kinetic release, ubuntu/ was added in the top Makefile:

  drivers-y       := drivers/ sound/ ubuntu/

Upstream commit 5750121 ("kbuild: list sub-directories in ./Kbuild")
changed how the top-level directories are listed.

It looks like ubuntu/ was lost in the process of rebasing.

Signed-off-by: Masahiro Yamada <[email protected]>
Signed-off-by: Andrea Righi <[email protected]>

Author: masahir0y

Kbuild

@@ -97,3 +97,4 @@ obj-$(CONFIG_SAMPLES)	+= samples/
 obj-$(CONFIG_NET)	+= net/
 obj-y			+= virt/
 obj-y			+= $(ARCH_DRIVERS)
+obj-y			+= ubuntu/