target/nios2: Declare QOM definitions in 'cpu-qom.h'

"target/foo/cpu.h" contains the target specific declarations.

A heterogeneous setup need to access target agnostic declarations
(at least the QOM ones, to instantiate the objects).

Our convention is to add such target agnostic QOM declarations in
the "target/foo/cpu-qom.h" header.
Add a comment clarifying that in the header.

Extract QOM definitions from "cpu.h" to "cpu-qom.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231013140116.255-10-philmd@linaro.org>

target/nios2/cpu-qom.h

@@ -0,0 +1,19 @@
+/*
+ * QEMU Nios II CPU QOM header (target agnostic)
+ *
+ * Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef QEMU_NIOS2_CPU_QOM_H
+#define QEMU_NIOS2_CPU_QOM_H
+
+#include "hw/core/cpu.h"
+#include "qom/object.h"
+
+#define TYPE_NIOS2_CPU "nios2-cpu"
+
+OBJECT_DECLARE_CPU_TYPE(Nios2CPU, Nios2CPUClass, NIOS2_CPU)
+
+#endif

target/nios2/cpu.h

@@ -21,20 +21,15 @@
 #ifndef NIOS2_CPU_H
 #define NIOS2_CPU_H
 
+#include "cpu-qom.h"
 #include "exec/cpu-defs.h"
-#include "hw/core/cpu.h"
 #include "hw/registerfields.h"
-#include "qom/object.h"
 
 typedef struct CPUArchState CPUNios2State;
 #if !defined(CONFIG_USER_ONLY)
 #include "mmu.h"
 #endif
 
-#define TYPE_NIOS2_CPU "nios2-cpu"
-
-OBJECT_DECLARE_CPU_TYPE(Nios2CPU, Nios2CPUClass, NIOS2_CPU)
-
 /**
  * Nios2CPUClass:
  * @parent_phases: The parent class' reset phase handlers.