rocr/driver: add virtio driver support for ROCm runtime

This commit adds virtio driver support to the ROCm runtime by:

1. Implementing KfdVirtioDriver class that inherits from core::Driver
2. Adding KFD_VIRTIO to DriverType enum
3. Registering virtio driver discovery function in topology
4. Adding virtio driver source files to CMake build

The virtio driver implementation provides basic memory management and
queue operations for virtualized GPU environments. Some advanced features
like PC sampling and SMI are currently not supported.

Key changes:
- Add new files: amd_kfd_virtio_driver.h/cpp
- Update CMakeLists.txt to include virtio driver
- Add VIRTIO to DriverType enum in driver.h
- Register virtio driver in amd_topology.cpp

Signed-off-by: Honglei Huang <Honglei1.Huang@amd.com>


[ROCm/ROCR-Runtime commit: d36cb195da]

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_topology.cpp

@@ -68,6 +68,9 @@
 #include "core/inc/amd_memory_region.h"
 #include "core/inc/runtime.h"
 #include "core/util/utils.h"
+#ifdef HSAKMT_VIRTIO_ENABLED
+#include "core/inc/amd_virtio_driver.h"
+#endif
 
 extern r_debug _amdgpu_r_debug;
 
@@ -78,13 +81,21 @@ namespace {
 #if _WIN32
 constexpr size_t num_drivers = 0;
 #elif __linux__
-constexpr size_t num_drivers = 2;
+constexpr size_t num_drivers = 2
+#ifdef HSAKMT_VIRTIO_ENABLED
+    + 1
+#endif
+    ;
 #endif
 
 const std::array<std::function<hsa_status_t(std::unique_ptr<core::Driver>&)>, num_drivers>
     discover_driver_funcs = {
 #ifdef __linux__
-        KfdDriver::DiscoverDriver, XdnaDriver::DiscoverDriver
+        KfdDriver::DiscoverDriver,
+        XdnaDriver::DiscoverDriver,
+#ifdef HSAKMT_VIRTIO_ENABLED
+        KfdVirtioDriver::DiscoverDriver,
+#endif
 #endif
 };