The userspace consumer can be built as a module but it cannot be
automatically probed as there is no device table to match it up with
device tree nodes.

Add the missing macro so that the module can load automatically.

Fixes: 5c51d4af ("regulator: userspace-consumer: Handle regulator-output DT nodes")
Signed-off-by: John Keeping <jkeeping@inmusicbrands.com>
Link: https://msgid.link/r/20240226160554.1453283-1-jkeeping@inmusicbrands.comSigned-off-by: Mark Brown <broonie@kernel.org>