powerpc/mpc8xxx: fix DDR data width checking
Checking width before setting DDR controller. SPD for DDR1 and DDR2 has data width and primary sdram width. The latter one has different meaning for DDR3. Signed-off-by: NYork Sun <yorksun@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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