dt-bindings: clock: versaclock5: Document 5P49V60 compatible string

dt-bindings: clock: versaclock5: Document 5P49V60 compatible string

The 5P49V60 clock generator is part of the same family of devices that is
described by the versaclock5 binding documentation.

Add the compatible string of the 5P49V60 to the binding documentation.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20230114233500.3294789-3-lars@metafoo.de
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>