monitor/hmp: Replace target_ulong -> vaddr in hmp_gva2gpa()

cpu_get_phys_page_debug() takes a vaddr type since commit
00b941e581 ("cpu: Turn cpu_get_phys_page_debug() into a CPUClass
hook").

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dave@treblig.org>
Message-Id: <20251229231546.50604-2-philmd@linaro.org>

monitor/hmp-cmds-target.c

@@ -301,7 +301,7 @@ void hmp_gpa2hva(Monitor *mon, const QDict *qdict)
 
 void hmp_gva2gpa(Monitor *mon, const QDict *qdict)
 {
-    target_ulong addr = qdict_get_int(qdict, "addr");
+    vaddr addr = qdict_get_int(qdict, "addr");
     CPUState *cs = mon_get_cpu(mon);
     hwaddr gpa;