media: include softomx plugin in omx HAL service

Bug: 132213171
Change-Id: I1a35db1344701a7e125e45543b4282b572a28182
(cherry picked from commit 3daf5d9146b74f3c03b1e2bd72bab547962ec351)
diff --git a/services/mediacodec/Android.mk b/services/mediacodec/Android.mk
index 473e21c..ecd437b 100644
--- a/services/mediacodec/Android.mk
+++ b/services/mediacodec/Android.mk
@@ -22,6 +22,7 @@
     libstagefright_soft_vorbisdec \
     libstagefright_soft_vpxdec \
     libstagefright_soft_vpxenc \
+    libstagefright_softomx_plugin \
 
 # service executable
 include $(CLEAR_VARS)