doc: mxc_hab: Improve the config option list

The original text is from the time that the config options were not
converted to Kconfig.

After the conversion to Kconfig only CONFIG_SECURE_BOOT and
CONFIG_CMD_DEKBLOB need to be selected by the user.

The other config options are automatically selected by the Kconfig
logic.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Breno Lima <breno.lima@nxp.com>

doc/README.mxc_hab

@@ -68,13 +68,10 @@ the CSF file.
 
 The DEK blob is generated by an authenticated U-Boot image with
 the dek_blob cmd enabled. The image used for DEK blob generation
-needs to have the following configurations enabled:
+needs to have the following configurations enabled in Kconfig:
 
-CONFIG_SECURE_BOOT
-CONFIG_SYS_FSL_SEC_COMPAT    4 /* HAB version */
-CONFIG_FSL_CAAM
-CONFIG_CMD_DEKBLOB
-CONFIG_SYS_FSL_SEC_LE
+CONFIG_SECURE_BOOT=y
+CONFIG_CMD_DEKBLOB=y
 
 Note: The encrypted boot feature is only supported by HABv4 or
 greater.