gta4xl-common: Don't build tinymix

* This tool can be built manually for debugging cases,
  there is no need to ship it in production

Change-Id: I9ab8b076b4bede70c368c198960ceabc68dad65b
diff --git a/platform/product_packages.mk b/platform/product_packages.mk
index f238956..279f7a7 100644
--- a/platform/product_packages.mk
+++ b/platform/product_packages.mk
@@ -6,8 +6,7 @@
 PRODUCT_PACKAGES += \
     libaudioroute \
     libtinyalsa \
-    libtinycompress \
-    tinymix
+    libtinycompress
 
 PRODUCT_PACKAGES += \
     audio.r_submix.default \