common: Drop asm/ptrace.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-mvebu/armada8k/dram.c b/arch/arm/mach-mvebu/armada8k/dram.c
index 265a8b0..3da9fa5 100644
--- a/arch/arm/mach-mvebu/armada8k/dram.c
+++ b/arch/arm/mach-mvebu/armada8k/dram.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
+#include <asm/ptrace.h>
 #include <asm/system.h>
 #include <linux/sizes.h>