plugins: remove non per_vcpu inline operation from API

plugins: remove non per_vcpu inline operation from API

Now we have a thread-safe equivalent of inline operation, and that all
plugins were changed to use it, there is no point to keep the old API.

In more, it will help when we implement more functionality (conditional
callbacks), as we can assume that we operate on a scoreboard.

API version bump was already done as part of this series.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20240304130036.124418-12-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240305121005.3528075-25-alex.bennee@linaro.org>