target/ppc: Fix helper_pminsn() prototype

GCC13 reports an error:

../target/ppc/excp_helper.c:2625:6: error: conflicting types for ‘helper_pminsn’ due to enum/integer mismatch; have ‘void(CPUPPCState *, powerpc_pm_insn_t)’ {aka ‘void(struct CPUArchState *, powerpc_pm_insn_t)’} [-Werror=enum-int-mismatch]
 2625 | void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn)
      |      ^~~~~~~~~~~~~
In file included from /home/legoater/work/qemu/qemu.git/include/qemu/osdep.h:49,
                 from ../target/ppc/excp_helper.c:19:
/home/legoater/work/qemu/qemu.git/include/exec/helper-head.h:23:27: note: previous declaration of ‘helper_pminsn’ with type ‘void(CPUArchState *, uint32_t)’ {aka ‘void(CPUArchState *, unsigned int)’}
   23 | #define HELPER(name) glue(helper_, name)
      |                           ^~~~~~~

Fixes: 7778a575c7 ("ppc: Add P7/P8 Power Management instructions")
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20230321161609.716474-4-clg@kaod.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

target/ppc/excp_helper.c

@@ -2622,7 +2622,7 @@ void helper_scv(CPUPPCState *env, uint32_t lev)
     }
 }
 
-void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn)
+void helper_pminsn(CPUPPCState *env, uint32_t insn)
 {
     CPUState *cs;