Allow fastbootd set boottime property

Bug: 264489957
Test: flash and no related avc error
Change-Id: Ia9a6d4918aa78e6b3e7df39496d786921192c8af
Signed-off-by: Wilson Sung <wilsonsung@google.com>
diff --git a/private/fastbootd.te b/private/fastbootd.te
index 7dc1741..a189d23 100644
--- a/private/fastbootd.te
+++ b/private/fastbootd.te
@@ -42,6 +42,7 @@
 
   # Mount /metadata to interact with Virtual A/B snapshots.
   allow fastbootd labeledfs:filesystem { mount unmount };
+  set_prop(fastbootd, boottime_prop)
 
   # Needed for reading boot properties.
   allow fastbootd proc_bootconfig:file r_file_perms;