drm/i2c/sil164: drop use of drmP.h

Drop use of the deprecated drmP.h header file.
Fix fallout.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Francisco Jerez <currojerez@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190716064220.18157-17-sam@ravnborg.org

drivers/gpu/drm/i2c/sil164_drv.c

@@ -26,8 +26,9 @@
 
 #include <linux/module.h>
 
-#include <drm/drmP.h>
+#include <drm/drm_drv.h>
 #include <drm/drm_encoder_slave.h>
+#include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/i2c/sil164.h>