board: phytec: Make AM6 SoM detection depend on I2C

SoM detection is using I2C driver model functions.
Let's depend on I2C.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Tested-by: John Ma <jma@phytec.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
1 file changed