firmware_loader: make RUST_FW_LOADER_ABSTRACTIONS select FW_LOADER

firmware_loader: make RUST_FW_LOADER_ABSTRACTIONS select FW_LOADER

[ Upstream commit 9906efa545d1d2cf25a614eeb219d3f8d5a302cd ]

The use of firmware_loader is an implementation detail of drivers rather
than a dependency. FW_LOADER is typically selected rather than depended
on; the Rust abstractions should do the same thing.

Fixes: de6582833db0 ("rust: add firmware abstractions")
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20251106-b4-select-rust-fw-v3-1-771172257755@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>