spi: dw: Move interrupt.h to spi-dw.h who is user of it

The actual user of interrupt.h is spi-dw.h and not bus drivers.
Move header there.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200506153025.21441-3-andriy.shevchenko@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>