Staging: vme: vme_ca91cx42: remove casts from void*

Remove unnesessary casts from void*.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>