Use vendor variant of libstagefright_foundation.

Rather than having a lib called libstagefright_foundation and one
called libstagefright_foundation_vendor, we now just have one library
and the build system keeps track of the vendor APIs that are exposed.

Test: (sanity) boot device, watch (part of) DRM protected movie.
Change-Id: I7495be3e8f546cac1b4909108313cf61fc85b1d8
diff --git a/drm/1.0/default/Android.mk b/drm/1.0/default/Android.mk
index 7916fba..0cc6e71 100644
--- a/drm/1.0/default/Android.mk
+++ b/drm/1.0/default/Android.mk
@@ -74,7 +74,7 @@
     libhidlmemory \
     libhidltransport \
     liblog \
-    libstagefright_foundation_vendor \
+    libstagefright_foundation \
     libutils \
 
 LOCAL_STATIC_LIBRARIES := \