Kconfig: Migrate CONFIG_CSF_SIZE to Kconfig

Move CONFIG_CSF_SIZE to Kconfig and define default value as 0x4000.

mx8mqevk requires 0x2000 add this configuration in imx8mq_evk_defconfig
file.

Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index aeb5493..d44f74e 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -43,6 +43,13 @@
 	  This option enables the support for secure boot (HAB).
 	  See doc/README.mxc_hab for more details.
 
+config CSF_SIZE
+	hex "Maximum size for Command Sequence File (CSF) binary"
+	default 0x4000
+	help
+	  Define the maximum size for Command Sequence File (CSF) binary
+	  this information is used to define the image boot data.
+
 config CMD_BMODE
 	bool "Support the 'bmode' command"
 	default y