dt-bindings: serial: sh-sci: Fix r8a78000 interrupts

commit ea9f6d31 upstream.

The SCIF instances on R-Car Gen5 have a single interrupt, just like on
other R-Car SoCs.

Fixes: 6ac1d604 ("dt-bindings: serial: sh-sci: Document r8a78000 bindings")
Cc: stable <stable@kernel.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/09bc9881b31bdb948ce8b69a2b5acf633f5505a4.1759920441.git.geert+renesas@glider.be


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>