Add SysProp to set the number of threads in Apexd bootstrap

Test: Manual. Tested on device
Bug: 265019048
Change-Id: I1d559b4398c2e91f50da48dc6d5ccbef63fb9d18
diff --git a/private/property_contexts b/private/property_contexts
index 51e6cf8..4fb5ee0 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -292,6 +292,7 @@
 apexd.config.dm_delete.timeout           u:object_r:apexd_config_prop:s0 exact uint
 apexd.config.dm_create.timeout           u:object_r:apexd_config_prop:s0 exact uint
 apexd.config.loop_wait.attempts          u:object_r:apexd_config_prop:s0 exact uint
+apexd.config.boot_activation.threads     u:object_r:apexd_config_prop:s0 exact uint
 persist.apexd.          u:object_r:apexd_prop:s0
 persist.vendor.apex.    u:object_r:apexd_select_prop:s0
 ro.boot.vendor.apex.    u:object_r:apexd_select_prop:s0