arm64: dts: renesas: r9a07g054: Fix SCI{Rx,Tx} interrupt types

As per the RZ/V2L Hardware User's Manual (Rev.1.00 Nov, 2021),
the interrupt type of SCI{Rx,Tx} is edge triggered.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Fixes: 7c2b8198 ("arm64: dts: renesas: Add initial DTSI for RZ/V2L SoC")
Link: https://lore.kernel.org/r/20220802101534.1401342-2-biju.das.jz@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>