!275 add configuration for histreamer created thread's stack size.

Merge pull request !275 from leo_ysl/master

config/subsystem/multimedia/config.gni

@@ -19,4 +19,8 @@ declare_args() {
   enable_histreamer_plugin_hdi_adapter = true
   enable_histreamer_plugin_file_source = true
   enable_histreamer_plugin_stream_source = true
+
+  # configuration for histreamer created thread's stack size.
+  # 0 means using system default thread stack size, other positive values will be accepted.
+  config_ohos_multimedia_histreamer_stack_size = 0
 }