GraphicBufferSource: ensure EOS buffer can be submitted

Sometimes, even mStopTimeUs is set by calling setStopTimeUs(), the EOS
buffer may still not be submitted, because fillCodecBuffer_l() may not
be called. So, remove this condition checking, and once if
submitEndOfInputStream_l() be called, mEndOfStremSent will be set to
true. So EOS buffer won't be send twice.

Bug: 2356695
Test: CTS test.
Change-Id: I5b69a9281f577e692eb2a471fe1998b0cb09ba45

media/libstagefright/bqhelper/GraphicBufferSource.cpp

@@ -1423,7 +1423,7 @@ status_t GraphicBufferSource::signalEndOfInputStream() {
     // stall since no future events are expected.
     mEndOfStream = true;
 
-    if (mStopTimeUs == -1 && mExecuting && !haveAvailableBuffers_l()) {
+    if (mExecuting && !haveAvailableBuffers_l()) {
         submitEndOfInputStream_l();
     }