spi: pxa2xx: Move number of CS pins validation out of condition

There is no need to allocate chip_data and then validate number of
CS pins as it will have the same effect. Hence move number of CS pins
validation out of condition in setup().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240403171550.1074644-2-andriy.shevchenko@linux.intel.com


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