Revert "remove /dev/log"

This reverts commit 8c60f74d.

Bug: 38242876
Change-Id: Iba5a94d16901dc0c52f1941972c26877baa4805c

private/file_contexts

@@ -91,6 +91,7 @@
 /dev/ion		u:object_r:ion_device:s0
 /dev/keychord   u:object_r:keychord_device:s0
 /dev/kmem		u:object_r:kmem_device:s0
+/dev/log(/.*)?		u:object_r:log_device:s0
 /dev/loop-control	u:object_r:loop_control_device:s0
 /dev/mem		u:object_r:kmem_device:s0
 /dev/modem.*		u:object_r:radio_device:s0

public/device.te

@@ -30,6 +30,7 @@ type hw_random_device, dev_type;
 type input_device, dev_type;
 type kmem_device, dev_type;
 type port_device, dev_type;
+type log_device, dev_type, mlstrustedobject;
 type mtd_device, dev_type;
 type mtp_device, dev_type, mlstrustedobject;
 type nfc_device, dev_type;