futility: updater: refactor {write,load}_system_firmware

The 'write_system_firmware' and 'load_system_firmware' have too many
parameters that are already contained in the updater_config.
To simplify the interfaces, we should just pass the updater_config to
{write,load}_system_firmware, and merge the write_firmware_sections
(only handling emulation and deciding the diff image) to the

Also moved the utility functions only used by *_system_firmware (for
example is_the_same_programmer and emulate_write_firmware) to the

The emulate_write_firmware is also revised to handle a list of sections
directly (so we don't need to handle that in write_system_firmware).

TEST=make; build and run test.

Change-Id: I4d123d12e8057da82d6c301899472e3773f3266e
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3508121
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Commit-Queue: Yu-Ping Wu <yupingso@chromium.org>
3 files changed