spi: dw: Parameterize the DMA Rx/Tx burst length

It isn't good to have numeric literals in the code especially if there
are multiple of them and they are related. Let's replace the Tx and Rx
burst level literals with the corresponding constants.

Co-developed-by: Georgy Vlasov <[email protected]>
Co-developed-by: Ramil Zaripov <[email protected]>
Signed-off-by: Georgy Vlasov <[email protected]>
Signed-off-by: Ramil Zaripov <[email protected]>
Signed-off-by: Serge Semin <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Alexey Malahov <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Feng Tang <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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