Add power stats service for specific device

Bug: 183052760
Test: dumpsys android.hardware.power.stats.IPowerStats/default
Change-Id: I20fa0e1b369f9b5f15e7881eea87ef699176dccc
Merged-In: I20fa0e1b369f9b5f15e7881eea87ef699176dccc
diff --git a/device-raven.mk b/device-raven.mk
index 8f2f382..26f1943 100644
--- a/device-raven.mk
+++ b/device-raven.mk
@@ -93,3 +93,6 @@
 
 # Display LBE
 PRODUCT_DEFAULT_PROPERTY_OVERRIDES += vendor.display.lbe.supported=1
+
+# PowerStats HAL
+PRODUCT_SOONG_NAMESPACES += device/google/raviole/powerstats/raven