hikey: Add PRODUCT_BRAND := Android to change build fingerprint

Change-Id: Ib1da8dcf977e0beac1a731ff1f9bab0ab0d72329
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
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