Migrate CAN bus HAL to nested namespaces

Test: it builds
Change-Id: I83d9ef4f1fff1585e6487c95f09b55b1aa5b3e63
diff --git a/automotive/can/1.0/default/libnetdevice/NetlinkSocket.h b/automotive/can/1.0/default/libnetdevice/NetlinkSocket.h
index 90e1f3f..2b40ea2 100644
--- a/automotive/can/1.0/default/libnetdevice/NetlinkSocket.h
+++ b/automotive/can/1.0/default/libnetdevice/NetlinkSocket.h
@@ -23,8 +23,7 @@
 
 #include <linux/netlink.h>
 
-namespace android {
-namespace netdevice {
+namespace android::netdevice {
 
 /**
  * A wrapper around AF_NETLINK sockets.
@@ -64,5 +63,4 @@
     DISALLOW_COPY_AND_ASSIGN(NetlinkSocket);
 };
 
-}  // namespace netdevice
-}  // namespace android
+}  // namespace android::netdevice