dt-bindings: clock: vc5: Add 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/20220511053455.360335-1-matthias.fend@emfend.at


Signed-off-by: Stephen Boyd <sboyd@kernel.org>