Revert "netd: set CLOEXEC on inherited /dev/socket/netd fd"

This reverts commit aae6f53e.

Reason for revert: https://android-review.googlesource.com/c/platform/system/netd/+/957201

 removed the netd socket.

Bug: 65862741
Change-Id: Ie7e598b9e50e1abfc9a90c25603d66bd08fa028a
Signed-off-by: Maciej Żenczykowski <maze@google.com>