logger: Add AM service logging category.

src/common/logging/backend.cpp

@@ -33,6 +33,7 @@ namespace Log {
     SUB(Kernel, SVC)                                                                               \
     CLS(Service)                                                                                   \
     SUB(Service, ACC)                                                                              \
+    SUB(Service, AM)                                                                               \
     SUB(Service, SM)                                                                               \
     SUB(Service, FS)                                                                               \
     SUB(Service, GSP)                                                                              \