manta: Add power hal

Change-Id: I6a5ce563c87c938e092977cae370add4b5e2cc46
diff --git a/device.mk b/device.mk
index db98c94..93529d8 100644
--- a/device.mk
+++ b/device.mk
@@ -79,6 +79,9 @@
 	audio.primary.default \
 	audio.a2dp.default
 
+PRODUCT_PACKAGES += \
+	power.manta
+
 # Filesystem management tools
 PRODUCT_PACKAGES += \
 	make_ext4fs