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/board/renesas/v3msk/MAINTAINERS b/board/renesas/v3msk/MAINTAINERS
new file mode 100644
index 0000000..12822a4
--- /dev/null
+++ b/board/renesas/v3msk/MAINTAINERS
@@ -0,0 +1,6 @@
+V3MSK BOARD
+M:	Cogent Embedded, Inc. <source@cogentembedded.com>
+S:	Maintained
+F:	board/renesas/v3msk/
+F:	include/configs/v3msk.h
+F:	configs/r8a77970_v3msk_defconfig