drm/via: Embed via_irq in via_dri1

All functions are made static as there are no more external users.
The file had new copyrights that are kept.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Kevin Brace <kevinbrace@bracecomputerlab.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220713170202.1798216-7-sam@ravnborg.org

drivers/gpu/drm/via/Makefile

@@ -3,6 +3,6 @@
 # Makefile for the drm device driver.  This driver provides support for the
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
 
-via-y    := via_irq.o via_dri1.o via_verifier.o via_dmablit.o
+via-y    := via_dri1.o via_verifier.o via_dmablit.o
 
 obj-$(CONFIG_DRM_VIA)	+=via.o

drivers/gpu/drm/via/via_drv.h

@@ -183,21 +183,12 @@ do {								\
 	remove_wait_queue(&(queue), &entry);			\
 } while (0)
 
-extern int via_wait_irq(struct drm_device *dev, void *data, struct drm_file *file_priv);
 extern int via_dma_blit_sync(struct drm_device *dev, void *data, struct drm_file *file_priv);
 extern int via_dma_blit(struct drm_device *dev, void *data, struct drm_file *file_priv);
 
 extern int via_init_context(struct drm_device *dev, int context);
 
 extern int via_do_cleanup_map(struct drm_device *dev);
-extern u32 via_get_vblank_counter(struct drm_device *dev, unsigned int pipe);
-extern int via_enable_vblank(struct drm_device *dev, unsigned int pipe);
-extern void via_disable_vblank(struct drm_device *dev, unsigned int pipe);
-
-extern irqreturn_t via_driver_irq_handler(int irq, void *arg);
-extern void via_driver_irq_preinstall(struct drm_device *dev);
-extern int via_driver_irq_postinstall(struct drm_device *dev);
-extern void via_driver_irq_uninstall(struct drm_device *dev);
 
 extern int via_dma_cleanup(struct drm_device *dev);
 extern void via_init_command_verifier(void);