sandbox: Move CONFIG_IO_TRACE to Kconfig

This is only used on sandbox, so select it there.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/Kconfig b/arch/Kconfig
index ae39716..51d46a4 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -146,6 +146,7 @@
 	select DM_SPI
 	select DM_SPI_FLASH
 	select GZIP_COMPRESSED
+	select IO_TRACE
 	select LZO
 	select OF_BOARD_SETUP
 	select PCI_ENDPOINT
diff --git a/common/Kconfig b/common/Kconfig
index 053e93e..8c71d3c 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -1086,3 +1086,6 @@
 	  These functions can be used by board to indicate to the OS
 	  the presence of the simple frame buffer with associated reserved
 	  memory
+
+config IO_TRACE
+	bool
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 1081e0b..1779f18 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -6,8 +6,6 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
-#define CONFIG_IO_TRACE
-
 #define CONFIG_MALLOC_F_ADDR		0x0010000
 
 /* Size of our emulated memory */