korad-kaxxxxp: support optional version after fixed ID response text

korad-kaxxxxp: support optional version after fixed ID response text

The combination of a literal expected ID response, and an optionally
trailing version information that need not be part of the driver's
strict expectation, would be useful to handle the RND devices' prefix.

Extend the "strict ID response text check", accept an optional version
text before checking for exhausted input. This commit only introduces
the support code, does not change the set of supported models.