powerpc: Switch <asm/global_data.h> to <linux/types.h>

In matching other architectures that have their global_data.h need to
bring in a types.h header, switch to <linux/types.h> on PowerPC.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/include/asm/global_data.h b/arch/powerpc/include/asm/global_data.h
index 6ed21c7..43d71f5 100644
--- a/arch/powerpc/include/asm/global_data.h
+++ b/arch/powerpc/include/asm/global_data.h
@@ -9,7 +9,7 @@
 #define __ASM_GBL_DATA_H
 
 #include <config.h>
-#include "asm/types.h"
+#include <linux/types.h>
 
 /* Architecture-specific global data */
 struct arch_global_data {