powerpc: Re-order setup_panic()

Do it right after probe_machine() since it's about testing ppc_md,
and put the test in the common code.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/setup_64.c

@@ -649,6 +649,8 @@ void __init setup_arch(char **cmdline_p)
 	/* Probe the machine type */
 	probe_machine();
 
+	setup_panic();
+
 	/*
 	 * We can discover serial ports now since the above did setup the
 	 * hash table management for us, thus ioremap works. We do that early
@@ -696,9 +698,6 @@ void __init setup_arch(char **cmdline_p)
 	 */
 	reserve_hugetlb_gpages();
 
-	if (ppc_md.panic)
-		setup_panic();
-
 	klp_init_thread_info(&init_thread_info);
 
 	init_mm.start_code = (unsigned long)_stext;