vfio: Reserve ioports when configuring the BAR

Let's be consistent and reserve ioports when we are configuring the BAR,
not when we map it, just like we do with mmio regions.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/1589470709-4104-5-git-send-email-alexandru.elisei@arm.com


Signed-off-by: Will Deacon <will@kernel.org>