staging: sbe-2t3e3: fix sparse warnings

warnings:

drivers/staging/sbe-2t3e3/netdev.c:30:56: warning: incorrect type in initializer (different address spaces)
drivers/staging/sbe-2t3e3/netdev.c:30:56:    expected void *data
drivers/staging/sbe-2t3e3/netdev.c:30:56:    got void [noderef] <asn:1>*
drivers/staging/sbe-2t3e3/netdev.c:48:44: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/sbe-2t3e3/netdev.c:48:44:    expected void const [noderef] <asn:1>*from
drivers/staging/sbe-2t3e3/netdev.c:48:44:    got void *data
drivers/staging/sbe-2t3e3/netdev.c:54:34: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/sbe-2t3e3/netdev.c:54:34:    expected void [noderef] <asn:1>*dst
drivers/staging/sbe-2t3e3/netdev.c:54:34:    got void *data

type must be __user.

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>