drm/panel-elida-kd35t133: Drop prepare/unprepare logic

Drop the prepare/unprepare logic, as this is now tracked elsewhere
since this commit [1].

[1] commit d2aacaf0 ("drm/panel: Check for already prepared/enabled in drm_panel")
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231117194405.1386265-6-macroalpha82@gmail.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231117194405.1386265-6-macroalpha82@gmail.com

drivers/gpu/drm/panel/panel-elida-kd35t133.c

@@ -43,7 +43,6 @@ struct kd35t133 {
 	struct regulator *vdd;
 	struct regulator *iovcc;
 	enum drm_panel_orientation orientation;
-	bool prepared;
 };
 
 static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
@@ -91,9 +90,6 @@ static int kd35t133_unprepare(struct drm_panel *panel)
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	int ret;
 
-	if (!ctx->prepared)
-		return 0;
-
 	ret = mipi_dsi_dcs_set_display_off(dsi);
 	if (ret < 0)
 		dev_err(ctx->dev, "failed to set display off: %d\n", ret);
@@ -109,8 +105,6 @@ static int kd35t133_unprepare(struct drm_panel *panel)
 	regulator_disable(ctx->iovcc);
 	regulator_disable(ctx->vdd);
 
-	ctx->prepared = false;
-
 	return 0;
 }
 
@@ -120,9 +114,6 @@ static int kd35t133_prepare(struct drm_panel *panel)
 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
 	int ret;
 
-	if (ctx->prepared)
-		return 0;
-
 	dev_dbg(ctx->dev, "Resetting the panel\n");
 	ret = regulator_enable(ctx->vdd);
 	if (ret < 0) {
@@ -166,8 +157,6 @@ static int kd35t133_prepare(struct drm_panel *panel)
 
 	msleep(50);
 
-	ctx->prepared = true;
-
 	return 0;
 
 disable_iovcc: