Remove unneeded version.h include from drivers/staging/bcm/headers.h

It was pointed out by 'make versioncheck' that a include of
linux/version.h is not needed in drivers/staging/bcm/headers.h .
This patch removes it.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>