spi: pxa2xx: Fix style of and typos in the comments and messages

Fix style of the comments and messages along with typos in them.

While at it, update Intel Copyright year.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210517140351.901-8-andriy.shevchenko@linux.intel.com


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