Fix the RS frame timeout.
Previous a slow app would block from receiving new
commands until the timer expired.  This change will
expire the timer immediatly.

Change-Id: I42b949d21f98ee0f1d3156763cd723c3e9cabb67
diff --git a/libs/rs/rsLocklessFifo.h b/libs/rs/rsLocklessFifo.h
index eabdc3e..4962ef6 100644
--- a/libs/rs/rsLocklessFifo.h
+++ b/libs/rs/rsLocklessFifo.h
@@ -57,9 +57,9 @@
     void commitSync(uint32_t command, uint32_t bytes);
 
     void flush();
-    void wait();
+    bool wait(uint64_t timeout = 0);
 
-    const void * get(uint32_t *command, uint32_t *bytesData);
+    const void * get(uint32_t *command, uint32_t *bytesData, uint64_t timeout = 0);
     void next();
 
     void makeSpace(uint32_t bytes);