alsa-utils: Add PACKAGECONFIG for udev

alsa-utils: Add PACKAGECONFIG for udev

Commit b92a3e9d093bc9421aa38a40bc6bfd559a16b3be introduced a dependency
on udev, which is undesirable for distros which don't otherwise require
or build udev (and, as such, don't have any interest in the rules.d files).

Make this conditional on a PACKAGECONFIG setting so that it can be turned
off.  If it's off, we don't depend on udev and don't ship the rules.

(From OE-Core rev: 262e69c9c7acf0beb7bb6b96299e3c993c906434)

Signed-off-by: Phil Blundell <pb@pbcl.net>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>