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Using the new AAPCS function remote execution support, add support to
read from and write to SPI flash connected to a device.
This allows flashing boot code to a device.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
[Andre: adjust to upstream changes]
Signed-off-by: Andre Przywara <osp@andrep.de>

This patch adds a wrapper script, which can automatically compile
and wrap a small C function, taking care of all the necessary
function arguments marshalling.

The functions 'aw_fel_remotefunc_prepare/aw_fel_remotefunc_execute'
allow using such functions in the sunxi-fel tool to get this code
executed remotely on the device.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
[Andre: adjust to match upstream changes]
Signed-off-by: Andre Przywara <osp@andrep.de>