Add architecture-specific global data

We plan to move architecture-specific data into a separate structure so
that we can make the rest of it common.

As a first step, create struct arch_global_data to hold these fields.
Initially it is empty.

This patch applies to all archs at once. I can split it if this is really
a pain.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index 41a26ed..9fddf3b 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -23,6 +23,11 @@
 
 #ifndef	__ASM_GBL_DATA_H
 #define __ASM_GBL_DATA_H
+
+/* Architecture-specific global data */
+struct arch_global_data {
+};
+
 /*
  * The following data structure is placed in some memory which is
  * available very early after boot (like DPRAM on MPC8xx/MPC82xx, or
@@ -83,6 +88,7 @@
 	unsigned long	post_log_res; /* success of POST test */
 	unsigned long	post_init_f_time; /* When post_init_f started */
 #endif
+	struct arch_global_data arch;	/* architecture-specific data */
 } gd_t;
 
 #include <asm-generic/global_data_flags.h>