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Since we recalculate cr0 each time we start a transfer the chip_data->cr0
becomes redundant. Remove it and related pieces.

This is a follow up to commit 0ed36990

 (spi: dw: Remove needless if
statements).
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>