powerpc fixes for 6.9 #3

 - Fix wireguard loading failure on pre-Power10 due to Power10 crypto routines.

 - Fix papr-vpd selftest failure due to missing variable initialization.

 - Avoid unnecessary get/put in spapr_tce_platform_iommu_attach_dev().

Thanks to: Geetika Moolchandani, Jason Gunthorpe, Michal Suchánek, Nathan Lynch,
Shivaprasad G Bhat.
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