pseries: Add compatible property to root of device tree

Currently, for the pseries machine the device tree supplied by qemu to SLOF
and from there to the guest does not include a 'compatible property' at the
root level.  Usually that works fine, since in this case the compatible
property doesn't really give any information not already found in the
'device_type' or 'model' properties.

However, the lack of 'compatible' confuses the bootloader install in the
SLES11 SP2 and SLES11 SP3 installers.  This patch therefore adds a token
'compatible' property to work around that.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Cc: qemu-stable@nongnu.org
Signed-off-by: NAlexander Graf <agraf@suse.de>

hw/spapr.c

@@ -260,6 +260,7 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
     _FDT((fdt_begin_node(fdt, "")));
     _FDT((fdt_property_string(fdt, "device_type", "chrp")));
     _FDT((fdt_property_string(fdt, "model", "IBM pSeries (emulated by qemu)")));
+    _FDT((fdt_property_string(fdt, "compatible", "qemu,pseries")));
 
     _FDT((fdt_property_cell(fdt, "#address-cells", 0x2)));
     _FDT((fdt_property_cell(fdt, "#size-cells", 0x2)));