iommu/amd: Unify format of the printed messages

Unify format of the printed messages, i.e. replace printk(LEVEL ... )
with pr_level(...).

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200507161804.13275-3-andriy.shevchenko@linux.intel.com


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