adl: Fix query of default fan speed

This fixes a crash of the AMD driver when quitting as we were trying
to apply what basically is an uninitialized value.

Adds additional code to cope with a failure to retrieve just in case
we hit another problem like that in the future.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
adl: Properly restore default perf levels

We were copying the *pointer* to the perf levels structure rather
than the structure itself, and thus restoring the perf levels
did basically nothing.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
core: Add back a dummy --scrypt option

Removing it means existing shell scripts fail unless they are updated
to remove passing the option. Instead, just print a deprecation
warning.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
misc: Add Benjamin to AUTHORS.

Rename AUTHORS to AUTHORS.md.
core: Clarify --scrypt deprecation message.