arm: imx: hab: Define rvt_check_target()

The hab_rvt_check_target() callback according to the HABv4 documentation:

"This function reports whether or not a given target region is allowed for
 either peripheral configuration or image loading in memory. It is intended
 for use by post-ROM boot stage components, via the ROM Vector Table, in
 order to avoid configuring security-sensitive peripherals, or loading
 images over sensitive memory regions or outside recognized memory devices
 in the address map."

It is a useful function to support as a precursor to calling into
authenticate_image() to validate the target memory region is good.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Sven Ebenfeld <sven.ebenfeld@gmail.com>
Cc: George McCollister <george.mccollister@gmail.com>
Cc: Breno Matheus Lima <brenomatheus@gmail.com>
Tested-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

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