ravb: Use separate clock for gPTP

RZ/V2M has a separate gPTP reference clock that is used when the
AVB-DMAC Mode Register (CCC) gPTP Clock Select (CSEL) bits are
set to "01: High-speed peripheral bus clock".
Therefore, add a feature that allows this clock to be used for
gPTP.

Signed-off-by: Phil Edworthy <[email protected]>
Reviewed-by: Biju Das <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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