arm64: dts: renesas: r8a779g3: Add Retronix R-Car V4H Sparrow Hawk board support

Add Retronix R-Car V4H Sparrow Hawk board based on Renesas R-Car V4H ES3.0
(R8A779G3) SoC. This is a single-board computer with single gigabit ethernet,
DSI-to-eDP bridge, DSI and two CSI2 interfaces, audio codec, two CANFD ports,
micro SD card slot, USB PD supply, USB 3.0 ports, M.2 Key-M slot for NVMe SSD,
debug UART and JTAG.

DT is imported from Linux next commit:
a719915e76f2 ("arm64: dts: renesas: r8a779g3: Add Retronix R-Car V4H Sparrow Hawk board support")

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/doc/board/renesas/renesas.rst b/doc/board/renesas/renesas.rst
index 0a38ff4..fedfeed 100644
--- a/doc/board/renesas/renesas.rst
+++ b/doc/board/renesas/renesas.rst
@@ -180,6 +180,12 @@
      - arm64
      - r8a779g0_whitehawk_defconfig
 
+   * -
+     - Sparrow Hawk
+     - R8A779G3 (V4H)
+     - arm64
+     - r8a779g3_sparrowhawk_defconfig
+
    * - RZ/G2 Family
      - Beacon EmbeddedWorks RZ/G2M SoM
      - R8A774A1 (RZ/G2M)