powerpc/32s: Use relocation offset when setting early hash table

When calling early_hash_table(), the kernel hasn't been yet
relocated to its linking address, so data must be addressed
with relocation offset.

Add relocation offset to write into Hash in early_hash_table().

Fixes: 69a1593a ("powerpc/32s: Setup the early hash table at all time.")
Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Tested-by: Serge Belyshev <belyshev@depni.sinp.msu.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/9e225a856a8b22e0e77587ee22ab7a2f5bca8753.1604740029.git.christophe.leroy@csgroup.eu