mmc: of_mmc_spi: Need to include irq.h and of_irq.h

Since these are the headers that provide irq_of_parse_and_map()
and NO_IRQ.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Chris Ball <cjb@laptop.org>