add related arm64 syscall for vfs2
add related arm64 syscall for vfs2

arm64 vfs2: Add support for io_submit/fallocate/
sendfile/newfstatat/readahead/fadvise64

Signed-off-by: Howard Zhang <90ec7750b2604c925990bbc10f98dfe9138a4c1a@arm.com>

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor