hikey: Add PRODUCT_BRAND := Android to change build fingerprint
am: 3965adabd5

Change-Id: Ib826eb81f9d7721dea19a8aefa6d4c85233e5cef
diff --git a/hikey.mk b/hikey.mk
index 575b428..0a8065c 100644
--- a/hikey.mk
+++ b/hikey.mk
@@ -13,3 +13,4 @@
 # Overrides
 PRODUCT_NAME := hikey
 PRODUCT_DEVICE := hikey
+PRODUCT_BRAND := Android