pnv/psi: Correct the pnv-psi* devices not to be sysbus devices

pnv_chip_power8_instance_init() creates a "pnv-psi-POWER8" sysbus
device in a way that leaves it unplugged.
pnv_chip_power9_instance_init() and pnv_chip_power10_instance_init()
do the same for "pnv-psi-POWER9" and "pnv-psi-POWER10", respectively.

These devices aren't actually sysbus devices.  Correct that.

Cc: "Cédric Le Goater" <clg@kaod.org>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: qemu-ppc@nongnu.org
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NCédric Le Goater <clg@kaod.org>
Message-Id: <20200609122339.937862-18-armbru@redhat.com>

hw/ppc/pnv_psi.c

@@ -943,7 +943,7 @@ static void pnv_psi_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo pnv_psi_info = {
     .name          = TYPE_PNV_PSI,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_DEVICE,
     .instance_size = sizeof(PnvPsi),
     .class_init    = pnv_psi_class_init,
     .class_size    = sizeof(PnvPsiClass),

include/hw/ppc/pnv_psi.h

@@ -31,7 +31,7 @@
 #define PSIHB_XSCOM_MAX         0x20
 
 typedef struct PnvPsi {
-    SysBusDevice parent;
+    DeviceState parent;
 
     MemoryRegion regs_mr;
     uint64_t bar;