driver: char: delete svm.c

hulk inclusion
category: other
bugzilla: https://gitee.com/openeuler/kernel/issues/I69JDF


CVE: NA

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Delete svm driver, as it is specially designed for Hisilicon platform.

Signed-off-by: Guo Mengqi <guomengqi3@huawei.com>
Reviewed-by: chenweilong <chenweilong@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>