HiKey: Add initial powerHAL

Mostly copied over from the flounder powerHAL,
this patch adds a basic powerHAL to include interactivty
boosting via the interactive cpufreq gov

Change-Id: I691d5874c7c61479aa4629fb2ae5dd83d52f4e4b
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/device.mk b/device.mk
index 3e4c615..7c9aa8f 100644
--- a/device.mk
+++ b/device.mk
@@ -75,6 +75,9 @@
 			wl18xx-fw-4.bin \
 			wl18xx-conf.bin
 
+# PowerHAL
+PRODUCT_PACKAGES += power.hikey
+
 # Copy hardware config file(s)
 PRODUCT_COPY_FILES +=  \
         device/linaro/hikey/etc/permissions/android.hardware.screen.xml:system/etc/permissions/android.hardware.screen.xml \