FSL DDR: Add DDR1 DIMM paramter support

Compute DIMM parameters based upon the SPD information in spd.

Signed-off-by: James Yang <James.Yang@freescale.com>
Signed-off-by: Jon Loeliger <jdl@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>