heap: use HEAP_TRACING_STACK_DEPTH default value for riscv

examples/system/sysview_tracing_heap_log/sdkconfig.defaults

@@ -27,4 +27,3 @@ CONFIG_APPTRACE_SV_EVT_TIMER_EXIT_ENABLE=y
 CONFIG_LOG_COLORS=n
 # Enable heap tracing to host
 CONFIG_HEAP_TRACING_TOHOST=y
-CONFIG_HEAP_TRACING_STACK_DEPTH=10

examples/system/sysview_tracing_heap_log/sdkconfig.defaults.esp32

@@ -0,0 +1,4 @@
+#
+# Heap memory debugging
+#
+CONFIG_HEAP_TRACING_STACK_DEPTH=10

examples/system/sysview_tracing_heap_log/sdkconfig.defaults.esp32s2

@@ -0,0 +1,4 @@
+#
+# Heap memory debugging
+#
+CONFIG_HEAP_TRACING_STACK_DEPTH=10