Use hidl.allocator for IAllocator.

android.hidl.memory is being split into android.hidl.memory and
android.hidl.allocator since the former is a passthrough hal and the
latter is a binderized service.

Bug: 35327976
Test: hidl_test, lshal, youtube/camera works
Change-Id: I7a2e72dcd3721d2689eb7ef95f5b140ecc1c446f
diff --git a/media/libaudiohal/Android.mk b/media/libaudiohal/Android.mk
index 617eb35..286c6b7 100644
--- a/media/libaudiohal/Android.mk
+++ b/media/libaudiohal/Android.mk
@@ -45,6 +45,7 @@
     android.hardware.audio.common@2.0      \
     android.hardware.audio.common@2.0-util \
     android.hardware.audio.effect@2.0      \
+    android.hidl.allocator@1.0             \
     android.hidl.memory@1.0                \
     libmedia_helper  \
     libmediautils