frd:u: Initial stub some functions

src/common/logging/backend.cpp

@@ -34,6 +34,7 @@ namespace Log {
         SUB(Kernel, SVC) \
         CLS(Service) \
         SUB(Service, SRV) \
+        SUB(Service, FRD) \
         SUB(Service, FS) \
         SUB(Service, ERR) \
         SUB(Service, APT) \

src/common/logging/log.h

@@ -49,6 +49,7 @@ enum class Class : ClassType {
     Service,                    ///< HLE implementation of system services. Each major service
                                 ///  should have its own subclass.
     Service_SRV,                ///< The SRV (Service Directory) implementation
+    Service_FRD,                ///< The FRD (Friends) service
     Service_FS,                 ///< The FS (Filesystem) service implementation
     Service_ERR,                ///< The ERR (Error) port implementation
     Service_APT,                ///< The APT (Applets) service