flash.sh: drop inhouse progress output on console when flashing with flashrom

[tlaurion]

Flashrom dropped --progress output under 1.2.
flashrom 1.4 still has no --progress output.

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Heads implemented in-house progress output as a workaround until fixed upstream.
That never happened.
This is still opened issue https://ticket.coreboot.org/issues/390

As per #1753 (comment) @JonathonHall-Purism comment:

What would you think about removing the progress bar? The dream would be to rework it (maybe doing it in flashrom itself, or at least providing a reliably-parseable progress output), but the current implementation is a huge pain, I don't feel it adds enough value to outweigh the pain. For comparison the read step takes a comparable amount of time and does not have a progress bar.

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So here, we drop progress output and leave user in the dark while they erase/write the firmware internally when upgrading Heads.

[tlaurion]

@JonathonHall-Purism works as intended. Merge?

[JonathonHall-Purism]

💯 Let's merge, thank you @tlaurion

I'm thrilled to see this go. While it's not awesome to leave users with an indefinite wait, it is far better than sometimes freezing during a critical potentially-bricking operation, and this code was a nightmare to maintain.

[tlaurion]

💯 Let's merge, thank you @tlaurion

I'm thrilled to see this go. While it's not awesome to leave users with an indefinite wait, it is far better than sometimes freezing during a critical potentially-bricking operation, and this code was a nightmare to maintain.

@JonathonHall-Purism please approve!

[tlaurion]

Master flashrom output for 1.3 with me typing on keyboard in between flashrom stating it will do write erase operations prior of doing them.

Not that bad.