service: Use nested namespace specifiers where applicable

There were a few places where nested namespace specifiers weren't being
used where they could be within the service code. This amends that to
make the namespacing a tiny bit more compact.

src/core/hle/service/sm/sm.cpp

@@ -11,8 +11,7 @@
 #include "core/hle/service/sm/sm.h"
 #include "core/hle/service/sm/srv.h"
 
-namespace Service {
-namespace SM {
+namespace Service::SM {
 
 static ResultCode ValidateServiceName(const std::string& name) {
     if (name.size() <= 0 || name.size() > 8) {
@@ -67,5 +66,4 @@ ResultVal<Kernel::SharedPtr<Kernel::ClientSession>> ServiceManager::ConnectToSer
     return client_port->Connect();
 }
 
-} // namespace SM
-} // namespace Service
+} // namespace Service::SM

src/core/hle/service/sm/sm.h

@@ -19,8 +19,7 @@ class ServerPort;
 class SessionRequestHandler;
 } // namespace Kernel
 
-namespace Service {
-namespace SM {
+namespace Service::SM {
 
 class SRV;
 
@@ -54,5 +53,4 @@ private:
     std::unordered_map<std::string, Kernel::SharedPtr<Kernel::ClientPort>> registered_services;
 };
 
-} // namespace SM
-} // namespace Service
+} // namespace Service::SM

src/core/hle/service/sm/srv.cpp

@@ -19,8 +19,7 @@
 #include "core/hle/service/sm/sm.h"
 #include "core/hle/service/sm/srv.h"
 
-namespace Service {
-namespace SM {
+namespace Service::SM {
 
 constexpr int MAX_PENDING_NOTIFICATIONS = 16;
 
@@ -266,5 +265,4 @@ SRV::SRV(std::shared_ptr<ServiceManager> service_manager)
 
 SRV::~SRV() = default;
 
-} // namespace SM
-} // namespace Service
+} // namespace Service::SM

src/core/hle/service/sm/srv.h

@@ -13,8 +13,7 @@ class HLERequestContext;
 class Semaphore;
 } // namespace Kernel
 
-namespace Service {
-namespace SM {
+namespace Service::SM {
 
 /// Interface to "srv:" service
 class SRV final : public ServiceFramework<SRV> {
@@ -37,5 +36,4 @@ private:
         get_service_handle_delayed_map;
 };
 
-} // namespace SM
-} // namespace Service
+} // namespace Service::SM