iommu/amd: Check PM_LEVEL_SIZE() condition in locked section

iommu/amd: Check PM_LEVEL_SIZE() condition in locked section

The increase_address_space() function has to check the PM_LEVEL_SIZE()
condition again under the domain->lock to avoid a false trigger of the
WARN_ON_ONCE() and to avoid that the address space is increase more
often than necessary.

Reported-by: Qian Cai <[email protected]>
Fixes: 754265bcab78 ("iommu/amd: Fix race in increase_address_space()")
Reviewed-by: Jerry Snitselaar <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>