libeffects: Added multichannel support for volume balance

Test: local native test (lvmtest)
Bug: 120941390
Change-Id: If982e03a57fb3a1e03d67f531c615bc016e7f3a5
diff --git a/media/libeffects/lvm/lib/Android.bp b/media/libeffects/lvm/lib/Android.bp
index 7a32d3f..d150f18 100644
--- a/media/libeffects/lvm/lib/Android.bp
+++ b/media/libeffects/lvm/lib/Android.bp
@@ -132,6 +132,9 @@
     shared_libs: [
         "liblog",
     ],
+    header_libs: [
+        "libhardware_headers"
+    ],
     cflags: [
         "-fvisibility=hidden",
         "-DBUILD_FLOAT",