The I2C adapter ID is actually depends on Board and may vary, Davinci
uses id=1, but in case of AM3517 id=3.

So modified respective davinci board files.
Signed-off-by: NVaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>