debug: enable mtrace autostart in debug overlay

This patch updates the debug overlay configuration to enable the
`LOG_BACKEND_ADSP_MTRACE_AUTOSTART` option. By setting this option to
'y', the ADSP mtrace logging backend will automatically start in the
debug overlay, facilitating detailed logging for debugging purposes.
This change allows developers to capture comprehensive logs during
debugging sessions, aiding in the identification and resolution of
issues.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>

Author: tmleman

app/debug_overlay.conf

@@ -15,3 +15,4 @@ CONFIG_DAI_VERBOSE_GLITCH_WARNINGS=y
 # CONFIG_SYS_HEAP_VALIDATE=y
 # CONFIG_SPIN_VALIDATE=y
 # CONFIG_SPIN_LOCK_TIME_LIMIT=50000
+CONFIG_LOG_BACKEND_ADSP_MTRACE_AUTOSTART=y