ARM: shmobile: document SK-RZG1E board

Document the SK-RZG1E device tree bindings, listing it as a supported board.

This allows to use checkpatch.pl to validate .dts files referring to the
SK-RZG1E board.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/arm/shmobile.txt

@@ -77,6 +77,8 @@ Boards:
     compatible = "renesas,salvator-x", "renesas,r8a7796";
   - SILK (RTP0RC7794LCB00011S)
     compatible = "renesas,silk", "renesas,r8a7794"
+  - SK-RZG1E (YR8A77450S000BE)
+    compatible = "renesas,sk-rzg1e", "renesas,r8a7745"
   - SK-RZG1M (YR8A77430S000BE)
     compatible = "renesas,sk-rzg1m", "renesas,r8a7743"
   - Wheat