target/sparc: Provide hint about CPUSPARCState::irq_manager member

CPUSPARCState::irq_manager holds a pointer to a QDev,
so declare it as DeviceState instead of void.

Move the comment about Leon3 fields.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Clément Chigot <chigot@adacore.com>
Message-Id: <20240130113102.6732-3-philmd@linaro.org>
diff --git a/target/sparc/cpu.h b/target/sparc/cpu.h
index edf46b3..f3cdd17 100644
--- a/target/sparc/cpu.h
+++ b/target/sparc/cpu.h
@@ -545,10 +545,9 @@
 #endif
     sparc_def_t def;
 
-    void *irq_manager;
+    /* Leon3 */
+    DeviceState *irq_manager;
     void (*qemu_irq_ack)(CPUSPARCState *env, int intno);
-
-    /* Leon3 cache control */
     uint32_t cache_control;
 };