Mock out more inputflinger host functions

Change-Id: I3de1e95930578410d8f7c1e77329c00f05b72325
diff --git a/services/inputflinger/host/InputDriver.h b/services/inputflinger/host/InputDriver.h
index 7734ac2..9bc14a7 100644
--- a/services/inputflinger/host/InputDriver.h
+++ b/services/inputflinger/host/InputDriver.h
@@ -68,6 +68,8 @@
 
 input_report_definition_t* create_output_report_definition(input_host_t* host);
 
+void free_report_definition(input_host_t* host, input_report_definition_t* report_def);
+
 void input_device_definition_add_report(input_host_t* host,
         input_device_definition_t* d, input_report_definition_t* r);