zephyr: wrapper: remove dead smex code

As of commit 0868b1f ("zephyr: Remove legacy logging artifacts")
smex is no longer included in Zephyr builds. As such, there's no need to
include a ".static_log_entries" ELF section in the Zephyr ELFs.

This was originally added via commit ca6e3c3 ("zephyr: add
smex_placeholder()").

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

zephyr/wrapper.c

@@ -167,29 +167,8 @@ unsigned int _xtos_ints_off(unsigned int mask)
  return 0;
 }
 
-/* Zephyr redefines log_message() and mtrace_printf() which leaves
- * totally empty the .static_log_entries ELF sections for the
- * sof-logger. This makes smex fail. Define at least one such section to
- * fix the build when sof-logger is not used.
- */
-static inline const void *smex_placeholder_f(void)
-{
- _DECLARE_LOG_ENTRY(LOG_LEVEL_DEBUG,
- "placeholder so .static_log.X are not all empty",
- _TRACE_INV_CLASS, 0);
-
- return &log_entry;
-}
-
-/* Need to actually use the function and export something otherwise the
- * compiler optimizes everything away.
- */
-const void *_smex_placeholder;
-
 int task_main_start(struct sof *sof)
 {
- _smex_placeholder = smex_placeholder_f();
-
  /* init default audio components */
  sys_comp_init(sof);