The sam926x docs allegedly don't list an "ECC_PARITY" field, and the 
header files in the upstream kernel don't have it either.

Masking with it was useless anyway, so just remove it.
Signed-off-by: NRichard Genoud <richard.genoud@gmail.com>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>