Kconfig: sandbox: Drop CONFIG_CMD_SANDBOX option

This is no-longer used. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/README b/README
index 0b5dafc..5dceb2e 100644
--- a/README
+++ b/README
@@ -815,7 +815,6 @@
 		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
 					  host
 		CONFIG_CMD_RUN		  run command in env variable
-		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
 		CONFIG_CMD_SAVES	* save S record dump
 		CONFIG_CMD_SDRAM	* print SDRAM configuration information
 					  (requires CONFIG_CMD_I2C)
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index 00bc6fc..87fba76 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -13,7 +13,6 @@
  * Alphabetical list of all possible commands.
  */
 
-#define CONFIG_CMD_SANDBOX	/* sb command to access sandbox features */
 #define CONFIG_CMD_SAVES	/* save S record dump		*/
 #define CONFIG_CMD_SDRAM	/* SDRAM DIMM SPD info printout */
 #define CONFIG_CMD_TERMINAL	/* built-in Serial Terminal	*/
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 28ad0a1..beb5a12 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -94,8 +94,6 @@
 #define CONFIG_BOOTP_SERVERIP
 #define CONFIG_IP_DEFRAG
 
-#define CONFIG_CMD_SANDBOX
-
 #define CONFIG_BOOTARGS ""
 
 #ifndef SANDBOX_NO_SDL
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index 5bc16fb..6cfd4a7 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -293,7 +293,6 @@
 CONFIG_CMDLINE_EDITING
 CONFIG_CMDLINE_PS_SUPPORT
 CONFIG_CMDLINE_TAG
-CONFIG_CMD_SANDBOX
 CONFIG_CMD_SAVES
 CONFIG_CMD_SCSI
 CONFIG_CMD_SDRAM