Optionally build recovery for hikey{,960}.

Bug: 117293412
Change-Id: Ic4c5119bc10827484a49a39b895bd82e678c6cf0
diff --git a/sepolicy/shell.te b/sepolicy/shell.te
new file mode 100644
index 0000000..3f17a5b
--- /dev/null
+++ b/sepolicy/shell.te
@@ -0,0 +1,4 @@
+recovery_only(`
+allow shell tmpfs:file r_file_perms;
+allow shell sysfs:file r_file_perms;
+')