Update name from trunk_stable_flags to aconfig flags

the name "trunk stable" is not recommended to appear in android code
base as it is an internal concept. therefore the name change.

Bug: b/295379636
Change-Id: Ice045ac00e2d4987221cc6516baa0d013e6e0943
diff --git a/private/property.te b/private/property.te
index a6598c2..892c94e 100644
--- a/private/property.te
+++ b/private/property.te
@@ -2,7 +2,7 @@
 system_internal_prop(adbd_prop)
 system_internal_prop(apexd_payload_metadata_prop)
 system_internal_prop(ctl_snapuserd_prop)
-system_internal_prop(device_config_trunk_stable_flags_prop)
+system_internal_prop(device_config_aconfig_flags_prop)
 system_internal_prop(device_config_core_experiments_team_internal_prop)
 system_internal_prop(device_config_lmkd_native_prop)
 system_internal_prop(device_config_mglru_native_prop)