This reduces sec_firmware_get_data to a single call to
fit_get_data_conf_prop. I think sec_firmware_check_copy_loadable could also
be converted, but it does not map as straightforwardly, so I have left it
for a future cleanup.
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
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