Without the header, the MODULE_DEVICE_TABLE() declaration fails:

drivers/mfd/altera-a10sr.c:153:1: error: data definition has no type or storage class [-Werror]
  153 | MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match);
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211013144402.2292128-1-arnd@kernel.org