staging: ozwpan: Rename Kbuild to Makefile

Rename Kbuild to usual Makefile, consistent with
Kernel build structure.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Rupesh Gujare <rupesh.gujare@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/ozwpan/Kbuild b/drivers/staging/ozwpan/Makefile
similarity index 100%
rename from drivers/staging/ozwpan/Kbuild
rename to drivers/staging/ozwpan/Makefile