arm64: dts: renesas: r8a77995: update PFC node name to pin-controller

This patch changes the name from from e6060000.pfc and pfc@e6060000 to
e6060000.pin-controller and pin-controller@e6060000 like other Renesas
SoCs.

Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>