[C61][DTO][EDP] sn65dsi86 fix edp signals timings and order

- now the backlight correctly start after the bridge
- the correct sequence is:
  1) VCC_LCD_EN (pca6416_20 5)
  2) iMX8_LVDS_BKL_ON (gpio4 4)
  3) VCC_BKL_EN (pca6416_20 9)

- also remove some edp_bridge parameters not present in the seco-sn65dsi86 driver

arch/arm64/boot/dts/seco/overlays/seco-imx8mm-c61-video-sn65dsi86-overlay.dts

@@ -38,11 +38,8 @@
 				regulator-min-microvolt = <3300000>;
 				regulator-max-microvolt = <3300000>;
 				gpio = <&gpio4 4 GPIO_ACTIVE_HIGH>;
-				off-on-delay = <20000>;
-				startup-delay-us = <1000>;
+				startup-delay-us = <300000>;
 				enable-active-high;
-				regulator-boot-on;
-				regulator-always-on;
 			};
 
 			reg_panel_on: panelon {
@@ -61,7 +58,7 @@
 	fragment@backlight {
 		target-path = "/";
 		__overlay__ {
-			backlight@0 {
+			backlight_edp: backlight_edp {
 				compatible = "pwm-backlight";
 				pwms = <&pwm1 0 5000000 0>; // 200Hz
 
@@ -69,7 +66,8 @@
 				num-interpolated-steps = <100>;
 				default-brightness-level = <80>;
 
-				enable-gpios = <&pca6416_20 9 GPIO_ACTIVE_HIGH>;
+				enable-gpios = <&pca6416_20 9 GPIO_ACTIVE_HIGH>;	//VCC_BKL_EN
+				power-supply = <&reg_bkl_on>;
 			};
 		};
 	};
@@ -79,6 +77,8 @@
 		__overlay__ {
 			panel_edp: edp_panel {
 				compatible = "seco-boe,ev156fhm", "panel-dpi";
+				backlight = <&backlight_edp>;
+
 				#address-cells = <1>;
 				#size-cells = <0>;
 				no-hpd;
@@ -147,18 +147,9 @@
 				reg = <0x2d>;
 				#address-cells = <1>;
 				#size-cells = <0>;
-				pd-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
-				bkl-gpios = <&pca6416_20 5 GPIO_ACTIVE_HIGH>;
-				vcc-supply = <&reg_bkl_on>;
-				dsi,max-lanes = <4>;
-				dsi,max-rate = <2500>;
+				pd-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;	// LVDS-eDP0_BRG_EN
+				lcd-gpios = <&pca6416_20 5 GPIO_ACTIVE_HIGH>;	// VCC_LCD_EN
 				dsi,mode-flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE | MIPI_DSI_MODE_LPM)>;
-				bkl_on_off_delay_range_us = <0 6000>;
-				lcd_on_off_delay_range_us = <0 200000>;
-
-				edp_irq-gpios = <&gpio4 27 IRQ_TYPE_EDGE_FALLING>;
-				read-dp-rate-from-panel;
-				enable-hpd;
 
 				si-result = <0xb0 0x41>,
 							<0xb1 0x72>,