docs: powerpc: add POWER9 and POWER10 to CPU families

Add POWER9 and POWER10 to CPU families and list Radix MMU.
Signed-off-by: Nicholas Miehlbradt <nicholas@linux.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220810040321.375396-1-nicholas@linux.ibm.com

Documentation/powerpc/cpu_families.rst

@@ -10,6 +10,7 @@ Book3S (aka sPAPR)
 ------------------
 
 - Hash MMU (except 603 and e300)
+- Radix MMU (POWER9 and later)
 - Software loaded TLB (603 and e300)
 - Selectable Software loaded TLB in addition to hash MMU (755, 7450, e600)
 - Mix of 32 & 64 bit::
@@ -100,6 +101,18 @@ Book3S (aka sPAPR)
           v
    +--------------+
    |    POWER8    |
+   +--------------+
+          |
+          |
+          v
+   +--------------+
+   |    POWER9    |
+   +--------------+
+          |
+          |
+          v
+   +--------------+
+   |   POWER10    |
    +--------------+