Remove unneeded version.h includes from drivers/staging/wlags49_h2/

It was pointed out by 'make versioncheck' that some includes of
linux/version.h are not needed in drivers/staging/wlags49_h2/.
This patch removes them.

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