virtio: Add virtio drivers

Summary:
- This commit adds virtio-mmio and virtio-net drivers

Impact:
- None (new drivers)

Testing:
- Tested with rv-virt (will be updated later) with QEMU-7.1

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Kconfig

@@ -1873,6 +1873,39 @@ config DEBUG_VIDEO_INFO
 		Enable video informational output to SYSLOG.
 
 endif # DEBUG_VIDEO
+
+config DEBUG_VIRTIO
+	bool "Virtio Debug Features"
+	default n
+	depends on DRIVERS_VIRTIO
+	---help---
+		Enable virtio debug features.
+
+if DEBUG_VIRTIO
+
+config DEBUG_VIRTIO_ERROR
+	bool "Virtio Error Output"
+	default n
+	depends on DEBUG_ERROR
+	---help---
+		Enable virtio error output to SYSLOG.
+
+config DEBUG_VIRTIO_WARN
+	bool "Virtio Warnings Output"
+	default n
+	depends on DEBUG_WARN
+	---help---
+		Enable virtio warning output to SYSLOG.
+
+config DEBUG_VIRTIO_INFO
+	bool "Virtio Informational Output"
+	default n
+	depends on DEBUG_INFO
+	---help---
+		Enable virtio informational output to SYSLOG.
+
+endif # DEBUG_VIDEO
+
 endif # DEBUG_FEATURES
 
 config DEBUG_TCBINFO