Add library to monitor the tablet orientation

Add a library based on accelerometer sensor to monitor
if the tablet is level via simple API.
This is needed to select the appropriate voice processing
mode when on table top.

Bug 7328122.

Change-Id: Ibb8860ecc444e21f87f1c8f2b1159861ddd706e2
diff --git a/device.mk b/device.mk
index 2924637..07b3e8c 100644
--- a/device.mk
+++ b/device.mk
@@ -142,7 +142,8 @@
 PRODUCT_PACKAGES += \
     audio.primary.manta \
     audio.a2dp.default \
-	audio.usb.default
+    audio.usb.default \
+    libbubblelevel
 
 PRODUCT_PACKAGES += \
     power.manta