spi: dw: always reprogram CTRL0

Instead of an additional reading from the register let's update it even if the
value is kept the same.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --cc drivers/spi/spi-dw.c
Simple merge