libdrmframeworkcommon: Explicitly reference libbinder headers

When creating this static lib, explicitly reference libbinder
to pick up its header include paths.

Bug: 27804373
Test: lib compiles when libbinder's header include
      paths change.

Change-Id: I6cd034703db8ef13f0bcaece27373a60fcde7b4e
diff --git a/drm/common/Android.mk b/drm/common/Android.mk
index db67534..ca3d2cd 100644
--- a/drm/common/Android.mk
+++ b/drm/common/Android.mk
@@ -31,6 +31,8 @@
     DrmInfoEvent.cpp \
     ReadWriteUtils.cpp
 
+LOCAL_STATIC_LIBRARIES := libbinder
+
 LOCAL_C_INCLUDES := \
     $(TOP)/frameworks/av/include \
     $(TOP)/frameworks/av/drm/libdrmframework/include \