ARM: dts: renesas: Remove leading 0x from rpc node

Remove the leading "0x" from rpc node to fix the below dtc warning:

Warning (simple_bus_reg): Node /soc/rpc@0xee200000 simple-bus unit
address format error, expected "ee200000"

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>