ixp: Move timestamp to arch_global_data

Move this field into arch_global_data and tidy up.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/ixp/timer.c b/arch/arm/cpu/ixp/timer.c
index 0450b51..663d989 100644
--- a/arch/arm/cpu/ixp/timer.c
+++ b/arch/arm/cpu/ixp/timer.c
@@ -70,14 +70,14 @@
 
 	if (readl(IXP425_OSST) & IXP425_OSST_TIMER_TS_PEND) {
 		/* rollover of timestamp timer register */
-		gd->timestamp += (0xFFFFFFFF - gd->arch.lastinc) + now + 1;
+		gd->arch.timestamp += (0xFFFFFFFF - gd->arch.lastinc) + now + 1;
 		writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
 	} else {
 		/* move stamp forward with absolut diff ticks */
-		gd->timestamp += (now - gd->arch.lastinc);
+		gd->arch.timestamp += (now - gd->arch.lastinc);
 	}
 	gd->arch.lastinc = now;
-	return gd->timestamp;
+	return gd->arch.timestamp;
 }
 
 
@@ -86,7 +86,7 @@
 	/* capture current timestamp counter */
 	gd->arch.lastinc = readl(IXP425_OSTS_B);
 	/* start "advancing" time stamp from 0 */
-	gd->timestamp = 0;
+	gd->arch.timestamp = 0;
 }
 
 ulong get_timer_masked(void)
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index ea27c16..5d414ef 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -41,6 +41,9 @@
 	unsigned long tbl;
 	unsigned long lastinc;
 	unsigned long long timer_reset_value;
+#ifdef CONFIG_IXP425
+	unsigned long timestamp;
+#endif
 };
 
 /*
@@ -65,9 +68,6 @@
 #ifdef CONFIG_FSL_ESDHC
 	unsigned long	sdhc_clk;
 #endif
-#ifdef CONFIG_IXP425
-	unsigned long	timestamp;
-#endif
 	unsigned long	relocaddr;	/* Start address of U-Boot in RAM */
 	phys_size_t	ram_size;	/* RAM size */
 	unsigned long	mon_len;	/* monitor len */