* allow udev-cache to be disabled at runtime (using
/etc/default/udev-cache);
* make cache invalidated if kernel, bootparams or device list
changes;
(From OE-Core rev: 22b72b23653736436f10d394de36201c32630d5d)
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>