ANDROID: GKI: remove export of tracing control functions

Android GKI kernel modules should NOT have the ability to control the
system-wide tracing functionality, nor query to determine if it is on or
not.  So remove the exports of these functions.

Upstream does not wish to do this, so an Android-only change is
required.  See the bug id for details.

Bug: 355584612
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I50f69cd9930ddc6b876c5c1dd86f51cfb2ee1bac