kernel/prism: care and feeding of the watchdog

It seems like we are being neglectful: Pet the watchdog once again
before the SPI flash is initialized since we seem to be cutting it
pretty close to the timeout still.

Change-Id: I4f6a50b2a1bbdc43a2c98f76bd340da9d840b846
(cherry picked from commit dae9a11e889782e5f32f5eb067f94bb71c73525b)
1 file changed