rust: pci: do not depend on CONFIG_PCI_MSI

The PCI abstractions do not actually depend on CONFIG_PCI_MSI; it also
breaks drivers that only depend on CONFIG_PCI, hence drop it.

While at it, move the module entry to its correct location.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501030744.4ucqC1cB-lkp@intel.com/
Fixes: 3a9c091 ("rust: pci: add basic PCI device / driver abstractions")
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

Author: Danilo Krummrich

rust/kernel/lib.rs

@@ -60,6 +60,8 @@ pub mod miscdevice;
 pub mod net;
 pub mod of;
 pub mod page;
+#[cfg(CONFIG_PCI)]
+pub mod pci;
 pub mod pid_namespace;
 pub mod platform;
 pub mod prelude;
@@ -86,8 +88,6 @@ pub mod workqueue;
 pub use bindings;
 pub mod io;
 pub use macros;
-#[cfg(all(CONFIG_PCI, CONFIG_PCI_MSI))]
-pub mod pci;
 pub use uapi;
 
 /// Prefix to appear before log messages printed from within the `kernel` crate.