ARM: renesas: Add R8A77970 V3MSK board and CPLD code

Add board code for the R8A77970 V3MSK board.
Add CPLD sysreset driver to the R-Car V3M SK board.
Extracted from a larger patch by Valentine Barshak.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Tam Nguyen <tam.nguyen.xa@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Sync configs and board code with V3M Eagle, squash CPLD driver in]
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 35f50f4..dd917ae 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1050,6 +1050,7 @@
 	r8a77965-ulcb-u-boot.dtb \
 	r8a77965-salvator-x-u-boot.dtb \
 	r8a77970-eagle-u-boot.dtb \
+	r8a77970-v3msk-u-boot.dtb \
 	r8a77980-condor-u-boot.dtb \
 	r8a77990-ebisu-u-boot.dtb \
 	r8a77995-draak-u-boot.dtb