mi-lttng: Move deprecated symbols to liblttng-ctl

mi-lttng: Move deprecated symbols to liblttng-ctl

The ABI diff between 2.13 and master hilights that the deprecated
variables are removed. Moving them to the deprecated-symbols file
ensures they are exported.

```
  [D] 'const char* const mi_lttng_context_type_perf_counter'    {mi_lttng_context_type_perf_counter}
  [D] 'const char* const mi_lttng_context_type_perf_cpu_counter'    {mi_lttng_context_type_perf_cpu_counter}
  [D] 'const char* const mi_lttng_context_type_perf_thread_counter'    {mi_lttng_context_type_perf_thread_counter}
  [D] 'const char* const mi_lttng_element_calibrate'    {mi_lttng_element_calibrate}
  [D] 'const char* const mi_lttng_element_calibrate_function'    {mi_lttng_element_calibrate_function}
  [D] 'const char* const mi_lttng_element_command_calibrate'    {mi_lttng_element_command_calibrate}
  [D] 'const char* const mi_lttng_element_track_untrack_pid_target'    {mi_lttng_element_track_untrack_pid_target}
  [D] 'const char* const mi_lttng_element_track_untrack_targets'
  {mi_lttng_element_track_untrack_targets}
```

Change-Id: I815556fac3281e0a4bf8ed92b8be0ce1b3276d02
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>