examples: use optee_examples instead of hello_world

Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
diff --git a/hikey.xml b/hikey.xml
index e45fe73..5088510 100644
--- a/hikey.xml
+++ b/hikey.xml
@@ -41,8 +41,8 @@
 	<!-- Linux kernel -->
 	<project remote="linaro-swg" path="linux" name="linux" revision="optee" />
 
-	<!-- Hello world TA -->
-	<project remote="linaro-swg" path="hello_world" name="hello_world" />
+	<!-- Sample applications -->
+	<project remote="linaro-swg" path="optee_examples" name="optee_examples.git" />
 
 	<!-- Filesystem -->
 	<project remote="linaro-swg" path="gen_rootfs" name="gen_rootfs" />