bluetooth.device.class_of_device should be type string

Bug: 217452259
Test: Manual, set property in system.prop, build, flash, make sure value
is reflected in getprop | grep bluetooth.device

Change-Id: Id4bfebb4da5bcd64ea4bac8e3c9e9754c96256c6
diff --git a/private/property_contexts b/private/property_contexts
index 1474d00..74b0aa6 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -473,7 +473,7 @@
 bluetooth.framework.adapter_address_validation       u:object_r:bluetooth_config_prop:s0 exact bool
 
 bluetooth.device.default_name                        u:object_r:bluetooth_config_prop:s0 exact string
-bluetooth.device.class_of_device                     u:object_r:bluetooth_config_prop:s0 exact uint
+bluetooth.device.class_of_device                     u:object_r:bluetooth_config_prop:s0 exact string
 
 bluetooth.profile.a2dp.sink.enabled                  u:object_r:bluetooth_config_prop:s0 exact bool
 bluetooth.profile.a2dp.source.enabled                u:object_r:bluetooth_config_prop:s0 exact bool