ALSA: Enable build with UML

ALSA: Enable build with UML

In order to facilitate testing using KUnit allow ALSA to build with UML,
it's not super useful at runtime but that's a user problem rather than
an actual dependency.  The apparent reason for the dependency was the
widespread use of iomem APIs in ALSA drivers, earlier patches in this
series have provided stubs for these APIs so that there are no build
time issues even without individual drivers having IOMEM dependencies
added.

Tested-by: David Gow <davidgow@google.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230718-asoc-topology-kunit-enable-v2-3-0ee11e662b92@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>