ARM: dts: rmobile: Make PFC and RST available early on Gen2 only

These do not need to be available early on Gen3 , so move them to
the respective DT files.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>