[U-Boot] [U-Boot, v2, 1/2] ARM: imx6: DHCOM i.MX6 PDK: use Kconfig for inclusion of DDR calibration

[sbabic at denx.de]

> From: Ludwig Zenz <lzenz at dh-electronics.de>
> The four x16 DDR3 are wired in T-topology. From NXP AN4467:
> 'Although not required, T-Topologies may also benefit from performing
> Write Leveling as there are package delays on both the processor and DDR
> devices that can be de-skewed by performing Write Leveling. Therefore,
> Freescale recommends determining Write Leveling calibration parameters
> for all boards, regardless of topology used.'
> That is why write level calibration is also done.
> Signed-off-by: Ludwig Zenz <lzenz at dh-electronics.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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