staging: ks7010: Remove unused define

After commit 6d6612de ("staging: ks7010: Remove unnecessary limit
checks"), this define is not used anywhere. Remove it as well.

Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>