fix uninitialized variable in SoftVideoDecoderOMXComponent.cpp

mUpdateColorAspects is uninitialized and resulting in notifying
unexpected OMX_EventPortSettingsChanged events

Test: VtsHalMediaOmx1_0Host
bug: 62601943
Change-Id: Ie1da74abce4f3b68fb8db0f0559b2ad81d6109b6
diff --git a/media/libstagefright/omx/SoftVideoDecoderOMXComponent.cpp b/media/libstagefright/omx/SoftVideoDecoderOMXComponent.cpp
index 98a9f54..920dd18 100644
--- a/media/libstagefright/omx/SoftVideoDecoderOMXComponent.cpp
+++ b/media/libstagefright/omx/SoftVideoDecoderOMXComponent.cpp
@@ -62,6 +62,7 @@
         mCropWidth(width),
         mCropHeight(height),
         mOutputPortSettingsChange(NONE),
+        mUpdateColorAspects(false),
         mMinInputBufferSize(384), // arbitrary, using one uncompressed macroblock
         mMinCompressionRatio(1),  // max input size is normally the output size
         mComponentRole(componentRole),