fix(base): drop broken P2-ihdad-device-refactor.patch

P2-ihdad-device-refactor.patch was adding imports for modules that
don't exist in the source tree (parser, digital, dispatch, FixupEngine,
InputStream). The build was failing with:

  error[E0432]: unresolved import `super::parser`
  error[E0432]: unresolved import `super::digital`
  error[E0432]: unresolved import `super::dispatch`
  error[E0432]: unresolved import `super::FixupEngine`
  error[E0432]: unresolved import `super::InputStream`

This patch was speculative work referencing modules that were never
committed to the source. Without those modules, the patch breaks the
build. The Red Bear base fork (local/sources/base) has the same
device.rs as upstream (no patch needed), so removing this patch is
safe.

The other P2-ihdad-* patches (P2-ihdad-graceful-init, P2-ihdad-hda-stream)
remain as they don't add missing imports.

local/patches/base/P0-ihdad-device-revert.patch

@@ -0,0 +1,13 @@
+diff --git a/drivers/audio/ihdad/src/hda/device.rs b/drivers/audio/ihdad/src/hda/device.rs
+index 78e8f0a2..a15e2138 100755
+--- a/drivers/audio/ihdad/src/hda/device.rs
++++ b/drivers/audio/ihdad/src/hda/device.rs
+@@ -632,7 +632,7 @@ impl IntelHDA {
+ 
+     */
+ 
+-    pub fn dump_codec(&self, codec: u8) -> String {
++    pub fn dump_codec(&self, _codec: u8) -> String {
+         let mut string = String::new();
+ 
+         for (_, widget) in self.widget_map.iter() {