Revert "hikey: change grub default branch"

This reverts commit c0ae393dcac33ae45e70bb141cf50d4c73480280.

This was originally due to OP-TEE/build#144 but fixed in
http://git.savannah.gnu.org/cgit/grub.git
d8901e3b (cache: Fix compilation for ppc, sparc and arm64)

Signed-off-by: Victor Chong <victor.chong@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Joakim Bech <joakim.bech@linaro.org>
diff --git a/hikey.xml b/hikey.xml
index 8e59e17..025b878 100644
--- a/hikey.xml
+++ b/hikey.xml
@@ -38,7 +38,7 @@
 	<project remote="96b-hk" path="OpenPlatformPkg" name="OpenPlatformPkg" revision="testing/hikey960_v1.3.4" />
 
 	<!-- grub -->
-	<project remote="savannah" path="grub" name="grub" revision="refs/tags/2.02" />
+	<project remote="savannah" path="grub" name="grub" />
 
 	<!-- Linux kernel -->
 	<project remote="linaro-swg" path="linux" name="linux" revision="optee" />
diff --git a/hikey_debian.xml b/hikey_debian.xml
index 859d315..9185f33 100644
--- a/hikey_debian.xml
+++ b/hikey_debian.xml
@@ -36,7 +36,7 @@
 	<project remote="96b-hk" path="OpenPlatformPkg" name="OpenPlatformPkg" revision="testing/hikey960_v1.3.4" />
 
 	<!-- grub -->
-	<project remote="savannah" path="grub" name="grub" revision="refs/tags/2.02"/>
+	<project remote="savannah" path="grub" name="grub" />
 
 	<!-- Linux kernel -->
 	<project remote="linaro" path="linux" name="rpk" revision="rpk-v4.9" />