rust: firmware: add `module_firmware!` macro

Analogous to the `module!` macro `module_firmware!` adds additional
firmware path strings to the .modinfo section.

In contrast to `module!`, where path strings need to be string literals,
path strings can be composed with the `firmware::ModInfoBuilder`.

Some drivers require a lot of firmware files (such as nova-core) and
hence benefit from more flexibility composing firmware path strings.

Acked-by: Jarkko Sakkinen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Danilo Krummrich <[email protected]>

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