ARM: OMAP: uWire clock calculation

In the uWire driver only one of the clock dividers was used to set
the clock to the required frequency. This will add a loop to try all
possible combinations using the other divider as well.

Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Juha Yrjölä <juha.yrjola@nokia.com>

diff --cc drivers/spi/omap_uwire.c
Simple merge