powerpc/powernv: Use CPU-endian PEST in pnv_pci_dump_p7ioc_diag_data()

commit 5adaf8629b193f185ca5a1665b9e777a0579f518 upstream.

This fixes the warnings reported from sparse:

  pci.c:312:33: warning: restricted __be64 degrades to integer
  pci.c:313:33: warning: restricted __be64 degrades to integer

Fixes: cee72d5b ("powerpc/powernv: Display diag data on p7ioc EEH errors")
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Willy Tarreau <w@1wt.eu>