davinci: da830: fix driver name for spi clocks

The spi driver name called out for the da830 spi clock list is not correct,
fix it.

Signed-off-by: Michael Williamson <michael.williamson@criticallink.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>