dt-bindings: cache: sifive,ccache0: Add StarFive JH7100 compatible

This cache controller is also used on the StarFive JH7100 SoC.
Unfortunately it needs a quirk to work properly, so add dedicated
compatible string to be able to match it.

Signed-off-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>