arm64: dts: renesas: r8a779g0: Add missing SCIF_CLK2

arm64: dts: renesas: r8a779g0: Add missing SCIF_CLK2

[ Upstream commit 08e799f6bce80dd63c174d8d0fc61d1a6149960b ]

R-Car V4H actually has two SCIF_CLK pins.
The second pin provides the SCIF_CLK signal for HSCIF2 and SCIF4.

Fixes: a4c31c56d2d35641 ("arm64: dts: renesas: r8a779g0: Add SCIF nodes")
Fixes: 39d9dfc6fbe1860e ("arm64: dts: renesas: r8a779g0: Add remaining HSCIF nodes")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/72f20c1bf32187bd30a963cafe27252907d661f9.1705589612.git.geert+renesas@glider.be
Signed-off-by: Sasha Levin <sashal@kernel.org>