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>