powerpc/eeh: Fix wrong printed PE number

On LE kernel, the non-existing PE number in BE format derived from
skiboot firmware isn't converted to LE format properly as following
kernel log indicates:

   EEH: Clear non-existing PHB#4-PE#200000000000000

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>