[U-Boot] Kconfig: Don't use RSA_FREESCALE_EXP on IMX

[Tom Rini]

On Thu, Mar 16, 2017 at 04:17:06PM -0500, George McCollister wrote:

> The CAAM in IMX parts doesn't support public key hardware acceleration
> (PKHA), so don't use RSA_FREESCALE_EXP. If you try to use it on IMX
> (assuming you have the clocks enabled first) you will get back an
> "Invalid KEY Command" error since PKHA isn't a valid key destination for
> these parts.
> 
> Signed-off-by: George McCollister <george.mccollister at gmail.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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