i2c definition for HummingBoard rev 3.0

Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
Coax SPDIF is 75ohm terminated

Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
Misc DT fixes

1. USB OTG is taken from floating RX_ER pin while it is defined as pull down,
   thus forcing USB OTG to be host.
2. usdhc1 and uart4 (Wifi / BT) connectivity on the microsom.

Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>