arm64: dts: renesas: r8a774[be]1-beacon: Sync aliases with RZ/G2M

arm64: dts: renesas: r8a774[be]1-beacon: Sync aliases with RZ/G2M

The Beacon Embedded RZ/G2[MNH] boards all have the same baseboard
and all share the same PCB.  To make sure all instances appear
the same, make the aliases for RZ/G2N and RZ/G2H match RZ/G2M to keep
them consistent.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230117232609.477247-1-aford173@gmail.com
Link: https://lore.kernel.org/r/20230117232609.477247-2-aford173@gmail.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>