spapr: Add "slb-size" property to CPU device tree nodes

According to a commit message in the Linux kernel (see here
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b60c31d85a2a
for example), the name of the property that carries the information
about the number of SLB entries should be called "slb-size", and
not "ibm,slb-size". The Linux kernel can deal with both names, but
to be on the safe side we should support the official name, too.

[Now that LoPAPR is public, the relevant requirement can be found in
section C.6.1.8 --dwg]

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/spapr.c

@@ -625,6 +625,7 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt, int offset,
 
     _FDT((fdt_setprop_cell(fdt, offset, "timebase-frequency", tbfreq)));
     _FDT((fdt_setprop_cell(fdt, offset, "clock-frequency", cpufreq)));
+    _FDT((fdt_setprop_cell(fdt, offset, "slb-size", env->slb_nr)));
     _FDT((fdt_setprop_cell(fdt, offset, "ibm,slb-size", env->slb_nr)));
     _FDT((fdt_setprop_string(fdt, offset, "status", "okay")));
     _FDT((fdt_setprop(fdt, offset, "64-bit", NULL, 0)));