Remove underscore from Companion service name

Fixes: 37536706
Test: Ensure no boot-time error and companion functionality works
Change-Id: I80ced92cb62aa10e1847980eb9a169af3bcd21f0

private/service_contexts

@@ -22,7 +22,7 @@ com.android.net.IProxyService             u:object_r:IProxyService_service:s0
 commontime_management                     u:object_r:commontime_management_service:s0
 common_time.clock                         u:object_r:mediaserver_service:s0
 common_time.config                        u:object_r:mediaserver_service:s0
-companion_device                          u:object_r:companion_device_service:s0
+companiondevice                           u:object_r:companion_device_service:s0
 connectivity                              u:object_r:connectivity_service:s0
 connmetrics                               u:object_r:connmetrics_service:s0
 consumer_ir                               u:object_r:consumer_ir_service:s0