Add gsm codec to the build

b/6620569

Change-Id: Ieb113ecc9d1195360335c29fc9d1256205cd2516
diff --git a/target/product/mini.mk b/target/product/mini.mk
index 299069d..169ba6e 100644
--- a/target/product/mini.mk
+++ b/target/product/mini.mk
@@ -128,6 +128,7 @@
     libstagefright_soft_amrwbenc \
     libstagefright_soft_flacenc \
     libstagefright_soft_g711dec \
+    libstagefright_soft_gsmdec \
     libstagefright_soft_h264dec \
     libstagefright_soft_h264enc \
     libstagefright_soft_mp3dec \