arm64: dts: renesas: r8a779md: Add support for R-Car M3Le R8A779MD Geist

Add support for the Geist board based on the Renesas R-Car R8A779MD (M3Le)
SoC, a register-compatible variant of the R8A77965 (M3-N) with reduced set
of peripherals.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Nguyen Tran <nguyen.tran.pz@bp.renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Link: https://patch.msgid.link/20260522172000.15096-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Author: nguyentranpz

arch/arm64/boot/dts/renesas/Makefile

@@ -60,6 +60,7 @@ r8a77965-salvator-xs-panel-aa104xd12-dtbs := r8a77965-salvator-xs.dtb salvator-p
 dtb-$(CONFIG_ARCH_R8A77965) += r8a77965-salvator-xs-panel-aa104xd12.dtb
 dtb-$(CONFIG_ARCH_R8A77965) += r8a77965-ulcb.dtb
 dtb-$(CONFIG_ARCH_R8A77965) += r8a77965-ulcb-kf.dtb
+dtb-$(CONFIG_ARCH_R8A77965) += r8a779md-geist.dtb
 
 dtb-$(CONFIG_ARCH_R8A77970) += r8a77970-eagle.dtb
 dtb-$(CONFIG_ARCH_R8A77970) += r8a77970-eagle-function-expansion.dtbo