refactor(imx): update config of mbedtls support

Pull in MbedTLS support for sha512 when greater than sha256 is required
based on refactoring for hash algorithm selection for Measured Boot.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I489392133435436a16edced1d810bc5204ba608f
1 file changed