ueventd: require opt-in for modalias handling

Some devices have modules.alias and modules.dep for modprobe and other
purposes but do not want to opt into ueventd auto loading their
modules.  Therefore we add a flag that can be added to ueventd
configuration files to opt into this behavior.

Bug: 111916071
Bug: 112048758
Test: check that modules are loaded with this opt-in
Test: check that modules are not loaded without this opt-in
Change-Id: Ifb281b273059b4671eea1ca5bc726c9e79f3adfb
diff --git a/init/devices.cpp b/init/devices.cpp
index ed4a739..ba08180 100644
--- a/init/devices.cpp
+++ b/init/devices.cpp
@@ -372,7 +372,7 @@
     }
 }
 
-void DeviceHandler::HandleDeviceEvent(const Uevent& uevent) {
+void DeviceHandler::HandleUevent(const Uevent& uevent) {
     if (uevent.action == "add" || uevent.action == "change" || uevent.action == "online") {
         FixupSysPermissions(uevent.path, uevent.subsystem);
     }
@@ -418,6 +418,10 @@
     HandleDevice(uevent.action, devpath, block, uevent.major, uevent.minor, links);
 }
 
+void DeviceHandler::ColdbootDone() {
+    skip_restorecon_ = true;
+}
+
 DeviceHandler::DeviceHandler(std::vector<Permissions> dev_permissions,
                              std::vector<SysfsPermissions> sysfs_permissions,
                              std::vector<Subsystem> subsystems, std::set<std::string> boot_devices,