clk: vc5: Add support for IDT/Renesas VersaClock 5P49V6975

Update IDT VersaClock 5 driver to support 5P49V6975. The 5P49V6975 is a
member of the VersaClock 6E family and supports four fractional dividers
(FODs), five clock outputs and an internal oscillator.

Signed-off-by: Matthias Fend <matthias.fend@emfend.at>
Link: https://lore.kernel.org/r/20220511053455.360335-2-matthias.fend@emfend.at


Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>