svm: Delete unused ioctl command

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I61RA3



-------------------------------

The following three ioctl command are not in used at all. Delete those
implementation.

SVM_IOCTL_SET_RC
SVM_IOCTL_REMAP_PROC

Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>