ppc4xx: Merge PPC4xx DDR and DDR2 ECC handling

This patch merges the ECC handling (ECC parity byte writing) into one
file (ecc.c) for all PPC4xx SDRAM controllers except for PPC440EPx/GRx.
This exception is because only those PPC's use the completely different
Denali SDRAM controller core.

Previously we had two routines to generate/write the ECC parity bytes.
With this patch we now only have one core function left.

Tested on Kilauea (no ECC) and Katmai (with and without ECC).

Signed-off-by: Stefan Roese <[email protected]>
Cc: Felix Radensky <[email protected]>
Cc: Grant Erickson <[email protected]>
Cc: Pieter Voorthuijsen <[email protected]>

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