powerpc/corenet_ds: add back buffer write for NOR flash
Enable buffer write for better performance. This platform uses a NOR flash chip which supports write buffer programming. CFI driver can query the buffer size and use it to program the flash for best performance. Signed-off-by: NYork Sun <yorksun@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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