Add SELinux context for a new lmk system property

Add SELinux context for a new lmk system property to add configurability
for delaying psi monitoring until boot completed.

Bug: 288566858
Test: Build, boot and verified logs for avc denial logs.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:6a80da52aa35a942e064c19fd31c01145d965688)
Merged-In: I7ba35f0ee5aad8f917e01c7586f04d11ed078633

Change-Id: I7ba35f0ee5aad8f917e01c7586f04d11ed078633
diff --git a/private/property_contexts b/private/property_contexts
index d556acf..5c08328 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -706,6 +706,7 @@
 ro.lmk.critical                 u:object_r:lmkd_config_prop:s0 exact int
 ro.lmk.critical_upgrade         u:object_r:lmkd_config_prop:s0 exact bool
 ro.lmk.debug                    u:object_r:lmkd_config_prop:s0 exact bool
+ro.lmk.delay_monitors_until_boot u:object_r:lmkd_config_prop:s0 exact bool
 ro.lmk.downgrade_pressure       u:object_r:lmkd_config_prop:s0 exact int
 ro.lmk.filecache_min_kb         u:object_r:lmkd_config_prop:s0 exact int
 ro.lmk.kill_heaviest_task       u:object_r:lmkd_config_prop:s0 exact bool