board: tqma6: implement ENET errata workaround detection

TQMa6 SOM beginning with hardware rev. 0200 comes in two flavours:
With and without a hardware workaround for ENET errata err006687.
Therefore we need two flavours of device tree. To be able to detect
the presence of the workaround we need to check GPIO1_6 is connected
to I2C bus or not. If the I2C bus is detected, the workaround is not
used and separate I2C buses are used for the SoM and the baseboard.

Later on this detection will be used to select the correct devicetree
at runtime.

Signed-off-by: Markus Niebel <[email protected]>
Signed-off-by: Max Merchel <[email protected]>

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