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>

arch/arm/mach-imx/mx6/Kconfig

@@ -244,6 +244,7 @@ config TARGET_MX6SABRESD
 
 config TARGET_MX6SLEVK
 	bool "mx6slevk"
+	select MX6SL
 	select SUPPORT_SPL
 
 config TARGET_MX6SLLEVK
@@ -396,6 +397,7 @@ config TARGET_WANDBOARD
 
 config TARGET_WARP
 	bool "WaRP"
+	select MX6SL
 	select BOARD_LATE_INIT
 
 config TARGET_XPRESS

configs/mx6slevk_defconfig

@@ -3,7 +3,7 @@ CONFIG_ARCH_MX6=y
 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

configs/mx6slevk_spinor_defconfig

@@ -3,7 +3,7 @@ CONFIG_ARCH_MX6=y
 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

configs/mx6slevk_spl_defconfig

@@ -10,7 +10,7 @@ CONFIG_SPL_LIBDISK_SUPPORT=y
 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

configs/warp_defconfig

@@ -2,7 +2,7 @@ CONFIG_ARM=y
 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