armv7: ls1021aiot: Move CONFIG_CMD_BOOTZ to Kconfig

CONFIG_CMD_BOOTZ symbol does not work in board config file
anymore, so fix this by moving it to Kconfig.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: NYork Sun <york.sun@nxp.com>

configs/ls1021aiot_qspi_defconfig

@@ -3,6 +3,7 @@ CONFIG_TARGET_LS1021AIOT=y
 CONFIG_DEFAULT_DEVICE_TREE="ls1021a-iot-duart"
 CONFIG_SYS_EXTRA_OPTIONS="QSPI_BOOT"
 CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y

configs/ls1021aiot_sdcard_defconfig

@@ -3,6 +3,7 @@ CONFIG_TARGET_LS1021AIOT=y
 CONFIG_DEFAULT_DEVICE_TREE="ls1021a-iot-duart"
 CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SPL_FSL_PBL,SD_BOOT,SD_BOOT_QSPI"
 CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_CMD_BOOTZ=y
 CONFIG_SPL=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0xe8

include/configs/ls1021aiot.h

@@ -280,7 +280,6 @@
 
 #define CONFIG_OF_BOARD_SETUP
 #define CONFIG_OF_STDOUT_VIA_ALIAS
-#define CONFIG_CMD_BOOTZ
 
 #define CONFIG_MISC_INIT_R