powerpc/pseries: Add support for FORM2 associativity

Description: Support for new memory types for Linux on Power. Form2 associativity adds a much more flexible NUMA topology layout than what is provided by Form1. This also allows PAPR SCM device to use better associativity when using the device as DAX KMEM device.

Bugzilla: http://bugzilla.redhat.com/1874111

Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=40263150

Tested: Successfully tested by IBM. I did sanity boot testing on power 9 (ibm-p9z-06-lp10) system.

Signed-off-by: Steve Best sbest@redhat.com