serial: sh-sci: Add device tree bindings for r8a7793

Also replaces "R-Car M2" with "R-Car M2-W" to avoid confusion.
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/renesas,sci-serial.txt

@@ -15,10 +15,14 @@ Required properties:
     - "renesas,scifa-r8a7790" for R8A7790 (R-Car H2) SCIFA compatible UART.
     - "renesas,scifb-r8a7790" for R8A7790 (R-Car H2) SCIFB compatible UART.
     - "renesas,hscif-r8a7790" for R8A7790 (R-Car H2) HSCIF compatible UART.
-    - "renesas,scif-r8a7791" for R8A7791 (R-Car M2) SCIF compatible UART.
-    - "renesas,scifa-r8a7791" for R8A7791 (R-Car M2) SCIFA compatible UART.
-    - "renesas,scifb-r8a7791" for R8A7791 (R-Car M2) SCIFB compatible UART.
-    - "renesas,hscif-r8a7791" for R8A7791 (R-Car M2) HSCIF compatible UART.
+    - "renesas,scif-r8a7791" for R8A7791 (R-Car M2-W) SCIF compatible UART.
+    - "renesas,scifa-r8a7791" for R8A7791 (R-Car M2-W) SCIFA compatible UART.
+    - "renesas,scifb-r8a7791" for R8A7791 (R-Car M2-W) SCIFB compatible UART.
+    - "renesas,hscif-r8a7791" for R8A7791 (R-Car M2-W) HSCIF compatible UART.
+    - "renesas,scif-r8a7793" for R8A7793 (R-Car M2-N) SCIF compatible UART.
+    - "renesas,scifa-r8a7793" for R8A7793 (R-Car M2-N) SCIFA compatible UART.
+    - "renesas,scifb-r8a7793" for R8A7793 (R-Car M2-N) SCIFB compatible UART.
+    - "renesas,hscif-r8a7793" for R8A7793 (R-Car M2-N) HSCIF compatible UART.
     - "renesas,scif-r8a7794" for R8A7794 (R-Car E2) SCIF compatible UART.
     - "renesas,scifa-r8a7794" for R8A7794 (R-Car E2) SCIFA compatible UART.
     - "renesas,scifb-r8a7794" for R8A7794 (R-Car E2) SCIFB compatible UART.