[FS#786] Please, add support to ecdsa key type

[LEDE Bugs]

The following task has a new comment added:

FS#786 - Please, add support to ecdsa key type
User who did this - Matthias Schiffer (NeoRaider)

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I agree that 23K are too much to enable by default.

One option out would be to create two dropbear package variants, so opkg can be used to install one or the other. Then we //might// also select the default variant for each image separately based on the flaash size, but I don't really like that idea, because it would be a deliberate inconsistency between images of the same target.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=786#comment2945