drm/display: Make DisplayPort AUX Chardev Kconfig name consistent

While most display helpers Kconfig symbols have the DRM_DISPLAY prefix,
the DisplayPort-AUX chardev interface uses DRM_DP_AUX_CHARDEV.

Since the number of users is limited and it's a selected symbol, we can
easily rename it to make it consistent.

Reviewed-by: Jani Nikula <[e-mail]>
Reviewed-by: Lucas De Marchi <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/display/Kconfig

···
 	help
 	  DRM display helpers for HDMI.
 
-config DRM_DP_AUX_CHARDEV
+config DRM_DISPLAY_DP_AUX_CHARDEV
 	bool "DRM DP AUX Interface"
 	depends on DRM && DRM_DISPLAY_HELPER
 	select DRM_DISPLAY_DP_HELPER

drivers/gpu/drm/display/Makefile

···
 drm_display_helper-$(CONFIG_DRM_DISPLAY_HDMI_HELPER) += \
 	drm_hdmi_helper.o \
 	drm_scdc_helper.o
-drm_display_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o
+drm_display_helper-$(CONFIG_DRM_DISPLAY_DP_AUX_CHARDEV) += drm_dp_aux_dev.o
 drm_display_helper-$(CONFIG_DRM_DP_CEC) += drm_dp_cec.o
 
 obj-$(CONFIG_DRM_DISPLAY_HELPER) += drm_display_helper.o

drivers/gpu/drm/display/drm_dp_helper.c

···
  * drm_dp_aux_register() in &drm_connector_funcs.late_register, and likewise to
  * call drm_dp_aux_unregister() in &drm_connector_funcs.early_unregister.
  * Functions which don't follow this will likely Oops when
- * %CONFIG_DRM_DP_AUX_CHARDEV is enabled.
+ * %CONFIG_DRM_DISPLAY_DP_AUX_CHARDEV is enabled.
  *
  * For devices where the AUX channel is a device that exists independently of
  * the &drm_device that uses it, such as SoCs and bridge devices, it is

drivers/gpu/drm/display/drm_dp_helper_internal.h

···
 
 struct drm_dp_aux;
 
-#ifdef CONFIG_DRM_DP_AUX_CHARDEV
+#ifdef CONFIG_DRM_DISPLAY_DP_AUX_CHARDEV
 int drm_dp_aux_dev_init(void);
 void drm_dp_aux_dev_exit(void);
 int drm_dp_aux_register_devnode(struct drm_dp_aux *aux);

drivers/gpu/drm/i915/Kconfig.debug

···
 	select REF_TRACKER
 	select STACKDEPOT
 	select STACKTRACE
-	select DRM_DP_AUX_CHARDEV
+	select DRM_DISPLAY_DP_AUX_CHARDEV
 	select DRM_DISPLAY_DP_TUNNEL_STATE_DEBUG if DRM_I915_DP_TUNNEL
 	select X86_MSR # used by igt/pm_rpm
 	select DRM_VGEM # used by igt/prime_vgem (dmabuf interop checks)