pinctrl: renesas: r8a779a0: Align comments

Align the CANFD4_TX and AVB2_MDC comments with all others.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/886ef84ea6b8314d348953792c9616b3e5dc28c0.1638537704.git.geert+renesas@glider.be