Change libhei.wrap to address the correct repo.

The libhei.wrap url was using the Gerrit repo when it should be
using the github repo.

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: Ic30ede52216d81716886ebcd407e2443f9242da8
diff --git a/subprojects/libhei.wrap b/subprojects/libhei.wrap
index dedce68..a603328 100644
--- a/subprojects/libhei.wrap
+++ b/subprojects/libhei.wrap
@@ -1,3 +1,3 @@
 [wrap-git]
-url = https://gerrit.openbmc-project.xyz/openbmc/openpower-libhei
+url = https://github.com/openbmc/openpower-libhei
 revision = head