drm/i2c/ch7006: Remove unnecessary include statements for drm_crtc_helper.h

Several source files include drm_crtc_helper.h without needing it or
only to get its transitive include statements; leading to unnecessary
compile-time dependencies.

Move drm_crtc_helper.h to where it is needed.

v2:
	* update commit message (Sam)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230116131235.18917-10-tzimmermann@suse.de

drivers/gpu/drm/i2c/ch7006_drv.c

@@ -26,6 +26,8 @@
 
 #include <linux/module.h>
 
+#include <drm/drm_crtc_helper.h>
+
 #include "ch7006_priv.h"
 
 /* DRM encoder functions */

drivers/gpu/drm/i2c/ch7006_priv.h

@@ -27,7 +27,6 @@
 #ifndef __DRM_I2C_CH7006_PRIV_H__
 #define __DRM_I2C_CH7006_PRIV_H__
 
-#include <drm/drm_crtc_helper.h>
 #include <drm/drm_encoder_slave.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/i2c/ch7006.h>