RISC-V: Use create_backend! over <F as TestBackendFactory>::new

Ole Krügerrequested to merge
ole-rv-create-backend into master

Part of RV-151

What

Replace backend instantiations using F::new where F: TestBackendFactory with a call to the create_backend! macro.

Why

I will need to change how backend tests work as part of RV-46. I want to have the instantiation logic in one place so that it is easier to change consistently later on.

Edited by Ole Krüger

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