powerpc updates for 6.9

 - Add AT_HWCAP3 and AT_HWCAP4 aux vector entries for future use by glibc.

 - Add support for recognising the Power11 architected and raw PVRs.

 - Add support for nr_cpus=n on the command line where the boot CPU is >= n.

 - Add ppcxx_allmodconfig targets for all 32-bit sub-arches.

 - Other small features, cleanups and fixes.

Thanks to: Akanksha J N, Brian King, Christophe Leroy, Dawei Li, Geoff Levand,
Greg Kroah-Hartman, Jan-Benedict Glaw, Kajol Jain, Kunwu Chan, Li zeming,
Madhavan Srinivasan, Masahiro Yamada, Nathan Chancellor, Nicholas Piggin, Peter
Bergner, Qiheng Lin, Randy Dunlap, Ricardo B. Marliere, Rob Herring, Sathvika
Vasireddy, Shrikanth Hegde, Uwe Kleine-König, Vaibhav Jain, Wen Xiong.
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