iommu/apple-dart: mark apple_dart_pm_ops static

This patch fixes the following sparse warning:

drivers/iommu/apple-dart.c:1279:1: sparse: warning: symbol 'apple_dart_pm_ops' was not declared. Should it be static?

No functional change intended.

Signed-off-by: Min-Hua Chen <minhuadotchen@gmail.com>
Acked-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20230720232155.3923-1-minhuadotchen@gmail.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>