spi: Add support for dual and quad mode
spi bus can support dual and quad wire data transfers for tx and rx. So defining dual and quad modes for both tx and rx. Also add support to parse bus width used for spi tx and rx transfers. Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com> Reviewed-by: NJagan Teki <jteki@openedev.com> Signed-off-by: NJagan Teki <jteki@openedev.com>
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