mx6sl: Select MX6SL option via Kconfig

Currently the MX6SL option is selected via CONFIG_SYS_EXTRA_OPTIONS,
but it is better to select it directly via Kconfig.

Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/mx6/Kconfig b/arch/arm/mach-imx/mx6/Kconfig
index 44d2db4..2b6bc1b 100644
--- a/arch/arm/mach-imx/mx6/Kconfig
+++ b/arch/arm/mach-imx/mx6/Kconfig
@@ -244,6 +244,7 @@
 
 config TARGET_MX6SLEVK
 	bool "mx6slevk"
+	select MX6SL
 	select SUPPORT_SPL
 
 config TARGET_MX6SLLEVK
@@ -396,6 +397,7 @@
 
 config TARGET_WARP
 	bool "WaRP"
+	select MX6SL
 	select BOARD_LATE_INIT
 
 config TARGET_XPRESS
diff --git a/configs/mx6slevk_defconfig b/configs/mx6slevk_defconfig
index 55e1d06..2d43ecc 100644
--- a/configs/mx6slevk_defconfig
+++ b/configs/mx6slevk_defconfig
@@ -3,7 +3,7 @@
 CONFIG_TARGET_MX6SLEVK=y
 # CONFIG_CMD_BMODE is not set
 CONFIG_DEFAULT_DEVICE_TREE="imx6sl-evk"
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6slevk/imximage.cfg,MX6SL"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6slevk/imximage.cfg"
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
diff --git a/configs/mx6slevk_spinor_defconfig b/configs/mx6slevk_spinor_defconfig
index 4397161..0b1ce5e 100644
--- a/configs/mx6slevk_spinor_defconfig
+++ b/configs/mx6slevk_spinor_defconfig
@@ -3,7 +3,7 @@
 CONFIG_TARGET_MX6SLEVK=y
 # CONFIG_CMD_BMODE is not set
 CONFIG_DEFAULT_DEVICE_TREE="imx6sl-evk"
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6slevk/imximage.cfg,MX6SL"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6slevk/imximage.cfg"
 CONFIG_SPI_BOOT=y
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y
diff --git a/configs/mx6slevk_spl_defconfig b/configs/mx6slevk_spl_defconfig
index 79ebe4c..41c57bd 100644
--- a/configs/mx6slevk_spl_defconfig
+++ b/configs/mx6slevk_spl_defconfig
@@ -10,7 +10,7 @@
 CONFIG_SPL_WATCHDOG_SUPPORT=y
 # CONFIG_CMD_BMODE is not set
 CONFIG_DEFAULT_DEVICE_TREE="imx6sl-evk"
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg,MX6SL"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SPL=y
 CONFIG_SPL_EXT_SUPPORT=y
diff --git a/configs/warp_defconfig b/configs/warp_defconfig
index 5e7eef0..2ac1c6c 100644
--- a/configs/warp_defconfig
+++ b/configs/warp_defconfig
@@ -2,7 +2,7 @@
 CONFIG_ARCH_MX6=y
 CONFIG_TARGET_WARP=y
 # CONFIG_CMD_BMODE is not set
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/warp/imximage.cfg,MX6SL"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/warp/imximage.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y