Migrate CAN bus HAL to nested namespaces

Test: it builds
Change-Id: I83d9ef4f1fff1585e6487c95f09b55b1aa5b3e63
diff --git a/automotive/can/1.0/default/CanBusVirtual.cpp b/automotive/can/1.0/default/CanBusVirtual.cpp
index cc59fa9..32fe8d6 100644
--- a/automotive/can/1.0/default/CanBusVirtual.cpp
+++ b/automotive/can/1.0/default/CanBusVirtual.cpp
@@ -19,12 +19,7 @@
 #include <android-base/logging.h>
 #include <libnetdevice/libnetdevice.h>
 
-namespace android {
-namespace hardware {
-namespace automotive {
-namespace can {
-namespace V1_0 {
-namespace implementation {
+namespace android::hardware::automotive::can::V1_0::implementation {
 
 CanBusVirtual::CanBusVirtual(const std::string& ifname) : CanBus(ifname) {}
 
@@ -52,9 +47,4 @@
     return true;
 }
 
-}  // namespace implementation
-}  // namespace V1_0
-}  // namespace can
-}  // namespace automotive
-}  // namespace hardware
-}  // namespace android
+}  // namespace android::hardware::automotive::can::V1_0::implementation