target-xtensa: Let cpu_xtensa_init() return XtensaCPU

Make the include paths for cpu-qom.h consistent to allow using XtensaCPU
in cpu.h.

Turn cpu_init macro into a static inline function returning
CPUXtensaState for backwards compatibility.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
diff --git a/target-xtensa/helper.c b/target-xtensa/helper.c
index 2094227..e6cb3fe 100644
--- a/target-xtensa/helper.c
+++ b/target-xtensa/helper.c
@@ -80,7 +80,7 @@
     }
 }
 
-CPUXtensaState *cpu_xtensa_init(const char *cpu_model)
+XtensaCPU *cpu_xtensa_init(const char *cpu_model)
 {
     static int tcg_inited;
     static int debug_handler_inited;
@@ -116,7 +116,7 @@
 
     xtensa_irq_init(env);
     qemu_init_vcpu(env);
-    return env;
+    return cpu;
 }