powerpc: Reflect the used arguments in machine_init() prototype

The "phys" argument to machine_init() isn't used and isn't likely to
ever be so let's remove it.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/setup_32.c

@@ -111,7 +111,7 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
  * This is called very early on the boot process, after a minimal
  * MMU environment has been set up but before MMU_init is called.
  */
-notrace void __init machine_init(unsigned long dt_ptr, unsigned long phys)
+notrace void __init machine_init(unsigned long dt_ptr)
 {
 	/* Enable early debugging if any specified (see udbg.h) */
 	udbg_early_init();