spi/sirf: add support for new SiRFmarco SMP SoC

the driver is also compatible with SiRFmarco except SiRFprimaII,
so simply add "sirf,marco-spi" to OF match table.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>