The winstream code itself is reasonably generic, but the console
integration was written to the intel_adsp memory window driver only,
as that was the only consumer.
Add an alternative that allows the winstream to be pointed to by a
linker symbol instead. The platform layer is responsible for putting
it where it needs to go.
Also includes a 20-byte "descriptor" recodr (with a very large magic
number) in the binary that points to the winstream, for the benefit of
external tooling that needs to find it at runtime.
Signed-off-by: Andy Ross <andyross@google.com>
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