arm: imx: Finish migration from CONFIG_SECURE_BOOT to CONFIG_IMX_HAB

There are a few remaining places where we say CONFIG_SECURE_BOOT rather
than CONFIG_IMX HAB.  Update these instances.

Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP i.MX U-Boot Team <uboot-imx@nxp.com>
Cc: Eddy Petrișor <eddy.petrisor@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Priyanka Jain <priyanka.jain@nxp.com>
Fixes: d714a75f ("imx: replace CONFIG_SECURE_BOOT with CONFIG_IMX_HAB")
Signed-off-by: Tom Rini <trini@konsulko.com>
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Changes in v2:
- Drop layerscape portion to its own patch