Set context for hash algorithm properties.

Also move verity_status_prop to system_restricted_prop since we
need to query it in cts tests

Bug: 175236047
Test: atest CtsNativeVerifiedBootTestCases
Change-Id: I82b26edaf5c5ad233bd83dff77eaafb9174646ef
diff --git a/private/shell.te b/private/shell.te
index e6038b1..0cdf43d 100644
--- a/private/shell.te
+++ b/private/shell.te
@@ -174,3 +174,6 @@
 
 # Allow shell to write MTE properties even on user builds.
 set_prop(shell, arm64_memtag_prop)
+
+# Allow shell to read the dm-verity props on user builds.
+get_prop(shell, verity_status_prop)