target/loongarch: Move some function definition to kvm directory

Move function definition specified with kvm to the corresponding
directory. Also remove header file "cpu.h" including outside of
macro QEMU_KVM_LOONGARCH_H.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

hw/loongarch/virt.c

@@ -46,6 +46,7 @@
 #include "hw/block/flash.h"
 #include "hw/virtio/virtio-iommu.h"
 #include "qemu/error-report.h"
+#include "kvm/kvm_loongarch.h"
 
 static void virt_get_veiointc(Object *obj, Visitor *v, const char *name,
                               void *opaque, Error **errp)

target/loongarch/cpu.h

@@ -496,13 +496,4 @@ static inline void set_pc(CPULoongArchState *env, uint64_t value)
 
 void loongarch_cpu_post_init(Object *obj);
 
-#ifdef CONFIG_KVM
-void kvm_loongarch_cpu_post_init(LoongArchCPU *cpu);
-#else
-static inline void kvm_loongarch_cpu_post_init(LoongArchCPU *cpu)
-{
-}
-#endif
-void kvm_loongarch_init_irq_routing(void);
-
 #endif /* LOONGARCH_CPU_H */

target/loongarch/kvm/kvm_loongarch.h

@@ -5,11 +5,11 @@
  * Copyright (c) 2023 Loongson Technology Corporation Limited
  */
 
-#include "cpu.h"
-
 #ifndef QEMU_KVM_LOONGARCH_H
 #define QEMU_KVM_LOONGARCH_H
 
+void kvm_loongarch_cpu_post_init(LoongArchCPU *cpu);
+void kvm_loongarch_init_irq_routing(void);
 int  kvm_loongarch_set_interrupt(LoongArchCPU *cpu, int irq, int level);
 void kvm_arch_reset_vcpu(CPUState *cs);