spi: altera: fix module autoload

Add the MODULE_DEVICE_TABLE macro for the platform_device_id table to
allow proper creation of modalias strings and fix autoloading module for
this driver.

Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Link: https://lore.kernel.org/r/1592962286-25752-3-git-send-email-yilun.xu@intel.com


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