Convert CONFIG_CMD_DISPLAY to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_DISPLAY

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 334e531..73fc29e 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -698,6 +698,14 @@
 	help
 	  Enable the "icache" and "dcache" commands
 
+config CMD_DISPLAY
+	bool "Enable the 'display' command, for character displays"
+	help
+	  (this needs porting to driver model)
+	  This enables the 'display' command which allows a string to be
+	  displayed on a simple board-specific display. Implement
+	  display_putc() to use it.
+
 config CMD_LED
 	bool "led"
 	default y if LED
diff --git a/configs/a4m072_defconfig b/configs/a4m072_defconfig
index 25a06cf..ce5edcb 100644
--- a/configs/a4m072_defconfig
+++ b/configs/a4m072_defconfig
@@ -14,6 +14,7 @@
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_SNTP=y
+CONFIG_CMD_DISPLAY=y
 CONFIG_CMD_FAT=y
 CONFIG_MAC_PARTITION=y
 # CONFIG_MMC is not set
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index 39e02c2..bba3b78 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -14,7 +14,6 @@
  */
 
 #define CONFIG_CMD_DATE		/* support for RTC, date/time...*/
-#define CONFIG_CMD_DISPLAY	/* Display support		*/
 #define CONFIG_CMD_DTT		/* Digital Therm and Thermostat */
 #define CONFIG_CMD_EEPROM	/* EEPROM read/write support	*/
 #define CONFIG_CMD_FDC		/* Floppy Disk Support		*/
diff --git a/include/configs/a4m072.h b/include/configs/a4m072.h
index e07a782..7909951 100644
--- a/include/configs/a4m072.h
+++ b/include/configs/a4m072.h
@@ -83,7 +83,6 @@
  */
 #define CONFIG_CMD_EEPROM
 #define CONFIG_CMD_IDE
-#define CONFIG_CMD_DISPLAY
 
 #if defined(CONFIG_PCI)
 #define CONFIG_CMD_PCI
diff --git a/include/configs/manroland/common.h b/include/configs/manroland/common.h
index 7f3231b..7d63e14 100644
--- a/include/configs/manroland/common.h
+++ b/include/configs/manroland/common.h
@@ -19,7 +19,6 @@
  * Command line configuration.
  */
 #define CONFIG_CMD_DATE
-#define CONFIG_CMD_DISPLAY
 #define CONFIG_CMD_EEPROM
 #define CONFIG_CMD_DTT
 #define CONFIG_CMD_IDE
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index 2ad4e08..11689e8 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -394,7 +394,6 @@
 CONFIG_CMDLINE_PS_SUPPORT
 CONFIG_CMDLINE_TAG
 CONFIG_CMD_DATE
-CONFIG_CMD_DISPLAY
 CONFIG_CMD_DS4510
 CONFIG_CMD_DS4510_INFO
 CONFIG_CMD_DS4510_MEM