hikey/hikey960: Fix powerHAL not loading

Apparently the powerHAL hasn't been loading due to the following
error:

 E vndksupport: Could not load /vendor/lib64/hw/android.hardware.power@1.0-impl.so from sphal namespace: dlopen failed: library "/vendor/lib64/hw/android.hardware.power@1.0-impl.so" not found.
 E ServiceManagement: Failed to dlopen android.hardware.power@1.0-impl.so: unknown error
 I PowerManagerService-JNI: Couldn't load power HAL service

This seems to be due to the android.hardware.power@1.0.vndk-sp
not being included. So include it to get things seemingly back
to working.

Change-Id: Idbfee756522fdf435cc2769e8c1742d0d7efc124
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/device-common.mk b/device-common.mk
index 05d82de..40cb0e3 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -228,6 +228,7 @@
     android.hardware.graphics.allocator@2.0.vndk-sp\
     android.hardware.graphics.mapper@2.0.vndk-sp\
     android.hardware.graphics.common@1.0.vndk-sp\
+    android.hardware.power@1.0.vndk-sp\
     libvndksupport.vndk-sp\
     libbinder.vndk-sp\
     libhwbinder.vndk-sp\