[U-Boot] hab_status & CONFIG_SECURE_BOOT - query

[C Supriya]

Hello Team , 

Am using u-boot 2015.07 version downloaded from git
I have two queries

1. Which is the file to enable secure boot config in this version for imx6q SabreSD board ? (CONFIG_SECURE_BOOT)
2. When I give the u-boot command 'hab_status' in u-boot prompt, am getting "Unknown command 'hab_status' - try 'help'"

Please let me know the solution for both.
-Supriya
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