dt-bindings: interrupt-controller: Add StarFive JH7100 plic

Add compatible string for StarFive JH7100 plic.

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>