arm64: dts: renesas: r8a774c0: Add missing assigned-clocks for CAN[01]

Define "assigned-clocks" and "assigned-clock-rates" properties
for CAN[01] DT nodes, as required by the dt-bindings.

Fixes: 036bc85c ("arm64: dts: renesas: r8a774c0: Add clkp2 clock to CAN nodes")
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>