powerpc: Move boot_paca into early_setup

The powerpc boot_paca symbol is now only used within the
early_setup() routine, so move it from its global definition
into early_setup().

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 6da881b..f2514e1 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -177,6 +177,8 @@
 
 void __init early_setup(unsigned long dt_ptr)
 {
+	static __initdata struct paca_struct boot_paca;
+
 	/* -------- printk is _NOT_ safe to use here ! ------- */
 
 	/* Identify CPU type */