ANDROID: GKI: enable CONFIG_TLS=m as a GKI module

Enable CONFIG_TLS as a GKI module. To do this, we need to remove the
`tls_statistics` parameter in `struct netns_mib` to avoid breaking the
KMI.

Bug: 382525591
Bug: 382615172
Bug: 409231068
Change-Id: Iff25073f4911274a6cc4883409130a0f1c96a78f
Signed-off-by: Pengtao He <hepengtao@xiaomi.com>
Signed-off-by: Will McVicker <willmcvicker@google.com>
(cherry picked from commit efb52cd9)