Revert "Restore system_server ioctl socket access."

The underlying ioctl denial was fixed in device-specific policy.
It's not needed in core policy.

A search of SELinux denials shows no reported denials, other than the
ones showing up on marlin.

This reverts commit ec3285cd.

(cherrypicked from commit 863ce3e7)

Test: AndroiTS GPS Test app shows GPS data, no SELinux denials.
Bug: 32290392
Change-Id: I1ba7bad43a2cdd7cdebbe1c8543a71eee765621d