Subsequent patches are going to add dependency/use of iommu_ops which is
initialized in subsys_initcall as well.

This moves pciobios_init() to the next initcall level.

This should not cause behavioral change.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/12303156.16998521.1678123842049.JavaMail.zimbra@raptorengineeringinc.com