Add persistent gwp-asan sysprops

Like the non-persistent variants, should be settable by shell without
root to allow external developer use on locked bootloaders.

Bug: 236738714
Test: atest bionic-unit-tests
Change-Id: Id9fc4abe491f560134267b06dd53c2dacca9422d
diff --git a/private/property_contexts b/private/property_contexts
index 8d33c24..3d1e7a5 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -732,7 +732,8 @@
 
 # GWP-ASan props. Separate from other libc.debug.* props, because we want users
 # to be able to set them from `adb shell` even on release devices.
-libc.debug.gwp_asan.  u:object_r:gwp_asan_prop:s0 prefix string
+libc.debug.gwp_asan.          u:object_r:gwp_asan_prop:s0 prefix string
+persist.libc.debug.gwp_asan.  u:object_r:gwp_asan_prop:s0 prefix string
 
 # shell-only props for ARM memory tagging (MTE).
 arm64.memtag. u:object_r:arm64_memtag_prop:s0 prefix string