Fix security vulnerability: potential OOB write in audioserver

am: 3f9a6d3bd9

Change-Id: Ia7aefc3e6e49f9e0105acc5fc816cd8e0bdd9cd9

include/hardware/audio_effect.h

@@ -895,6 +895,9 @@ typedef struct effect_param_s {
     char        data[];     // Start of Parameter + Value data
 } effect_param_t;
 
+// Maximum effect_param_t size
+#define EFFECT_PARAM_SIZE_MAX       65536
+
 // structure used by EFFECT_CMD_OFFLOAD command
 typedef struct effect_offload_param_s {
     bool isOffload;         // true if the playback thread the effect is attached to is offloaded