Migrate CAN bus HAL to nested namespaces

Test: it builds
Change-Id: I83d9ef4f1fff1585e6487c95f09b55b1aa5b3e63
diff --git a/automotive/can/1.0/default/CanBusVirtual.h b/automotive/can/1.0/default/CanBusVirtual.h
index c2d5794..3990b20 100644
--- a/automotive/can/1.0/default/CanBusVirtual.h
+++ b/automotive/can/1.0/default/CanBusVirtual.h
@@ -18,12 +18,7 @@
 
 #include "CanBus.h"
 
-namespace android {
-namespace hardware {
-namespace automotive {
-namespace can {
-namespace V1_0 {
-namespace implementation {
+namespace android::hardware::automotive::can::V1_0::implementation {
 
 struct CanBusVirtual : public CanBus {
     CanBusVirtual(const std::string& ifname);
@@ -36,9 +31,4 @@
     bool mWasCreated = false;
 };
 
-}  // namespace implementation
-}  // namespace V1_0
-}  // namespace can
-}  // namespace automotive
-}  // namespace hardware
-}  // namespace android
+}  // namespace android::hardware::automotive::can::V1_0::implementation