spi: ti_qspi: Add support for CS other than CS0
Make sure corresponding setup registers are updated depending on CS. This ensures that driver can support QSPI flashes on ChipSelects other than on CS0 Reported-by: NAndreas Dannenberg <dannenberg@ti.com> Signed-off-by: NVignesh Raghavendra <vigneshr@ti.com> Reviewed-by: NJagan Teki <jagan@amarulasolutions.com>
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