powerpc: Merge smp.c and smp.h

This also moves setup_cpu_maps to setup-common.c (calling it
smp_setup_cpu_maps) and uses it on both 32-bit and 64-bit.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/setup_32.c

@@ -288,6 +288,8 @@ void __init setup_arch(char **cmdline_p)
 	unflatten_device_tree();
 	finish_device_tree();
 
+	smp_setup_cpu_maps();
+
 #ifdef CONFIG_BOOTX_TEXT
 	init_boot_display();
 #endif