serial/arc-uart: switch to devicetree based probing

* DT binding for arc-uart
* With alll the bits in place we can now use DT probing.

Note that there's a bit of kludge right now because earlyprintk portion
of driver can't use the DT infrastrcuture to get resoures/plat_data.
This requires some infrastructre changes to of_flat_ framework

Signed-off-by: Vineet Gupta <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: [email protected]
Cc: Rob Herring <[email protected]>
Cc: Rob Landley <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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