fsl-ddr: add override for the Rtt_Wr
Different boards may require different settings of Dynamic ODT (Rtt_Wr). We provide a means to allow the board specific code to provide its own value of Rtt_Wr. Signed-off-by: NDave Liu <daveliu@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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