Add GPU driver interrupt handling, Intel GPU PCI config, and display improvements

AMD display driver: expanded DCN pipeline setup with plane/controller/stream mapping.
Intel driver: cleaned up module structure.
New interrupt module for MSI-X vector management across GPU drivers.
PCID config endpoint patch and Intel GPU TOML for automatic driver spawning.
Expanded redox_stubs with additional kernel API shims.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/config/pcid.d/intel_gpu.toml

@@ -0,0 +1,17 @@
+# PCID configuration for Intel GPU auto-detection
+# When pcid detects an Intel GPU (vendor 0x8086, class 0x03),
+# it launches redox-drm with the PCI device location.
+
+[[device]]
+vendor = 0x8086
+class = 0x03
+subclass = 0x00
+command = ["redox-drm"]
+args = ["$BUS", "$DEV", "$FUNC"]
+
+[[device]]
+vendor = 0x8086
+class = 0x03
+subclass = 0x02
+command = ["redox-drm"]
+args = ["$BUS", "$DEV", "$FUNC"]