config/udev: Include header <sys/sysmacros.h> to use major/minor

glibc 2.25 has dropped sys/sysmacros.h from sys/types.h, so add
it explicitly in config/udev.c.

This is similar to the commit 84e3b96b

Signed-off-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Adam Jackson <ajax@redhat.com>