service/am: Add missing am services

Adds the basic skeleton for missing am services idle:sys, omm, and spsm
based off the information provided by Switch Brew.

src/core/hle/service/am/omm.cpp

@@ -0,0 +1,42 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/hle/service/am/omm.h"
+
+namespace Service::AM {
+
+OMM::OMM() : ServiceFramework{"omm"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "GetOperationMode"},
+        {1, nullptr, "GetOperationModeChangeEvent"},
+        {2, nullptr, "EnableAudioVisual"},
+        {3, nullptr, "DisableAudioVisual"},
+        {4, nullptr, "EnterSleepAndWait"},
+        {5, nullptr, "GetCradleStatus"},
+        {6, nullptr, "FadeInDisplay"},
+        {7, nullptr, "FadeOutDisplay"},
+        {8, nullptr, "Unknown1"},
+        {9, nullptr, "Unknown2"},
+        {10, nullptr, "Unknown3"},
+        {11, nullptr, "Unknown4"},
+        {12, nullptr, "Unknown5"},
+        {13, nullptr, "Unknown6"},
+        {14, nullptr, "Unknown7"},
+        {15, nullptr, "Unknown8"},
+        {16, nullptr, "Unknown9"},
+        {17, nullptr, "Unknown10"},
+        {18, nullptr, "Unknown11"},
+        {19, nullptr, "Unknown12"},
+        {20, nullptr, "Unknown13"},
+        {21, nullptr, "Unknown14"},
+        {22, nullptr, "Unknown15"},
+        {23, nullptr, "Unknown16"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+} // namespace Service::AM