ARM: shmobile: fix SILK board name

Unfortunately, the SILK board bindings were not quite correct, as the  board
name should be all caps.  Fix that,  adding the board model #  in parens and
removing stray semicolon.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/arm/shmobile.txt

@@ -57,5 +57,5 @@ Boards:
     compatible = "renesas,marzen", "renesas,r8a7779"
   - Porter (M2-LCDP)
     compatible = "renesas,porter", "renesas,r8a7791"
-  - Silk
-    compatible = "renesas,silk", "renesas,r8a7794";
+  - SILK (RTP0RC7794LCB00011S)
+    compatible = "renesas,silk", "renesas,r8a7794"