Bugfix - Panic Handler not halting when running on both cores

Bug occurs when core dump destination in menuconfig is set to flash. When
programme crashes, xt_unhandled_exception or panicHandler will both trigger
commonErrorHandler. commonErrorHandler calls esp_core_dump_to_flash which
will attempt to use DPORT functions and hang due to trying to a stall and already
stalled processor (already stalled in xt_unhandled_exception and panicHandler).
Program will eventually be rebooted when wdt expires.

Added esp_dport_access_int_deinit after calls to haltOtherCore() so that DPORT
functions don't try to halt and already halted cpu hence preventing hang.

Fixes TW#12944 https://github.com/espressif/esp-idf/issues/646

components/esp32/panic.c

@@ -197,6 +197,7 @@ void panicHandler(XtExcFrame *frame)
         return;
     }
     haltOtherCore();
+    esp_dport_access_int_deinit();
     panicPutStr("Guru Meditation Error: Core ");
     panicPutDec(core_id);
     panicPutStr(" panic'ed (");
@@ -244,6 +245,7 @@ void panicHandler(XtExcFrame *frame)
 void xt_unhandled_exception(XtExcFrame *frame)
 {
     haltOtherCore();
+    esp_dport_access_int_deinit();
     if (!abort_called) {
         panicPutStr("Guru Meditation Error of type ");
         int exccause = frame->exccause;