rockchip: rk3288-firefly: Drop unused SPL_LED related code

The firefly-rk3288_defconfig build target does not enable the SPL_LED
Kconfig option.

Drop the unused SPL_LED related code and replace it with a default-state
prop to ensure the LED driver enable the LED at U-Boot proper phase.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3288-firefly-u-boot.dtsi b/arch/arm/dts/rk3288-firefly-u-boot.dtsi
index 644198a..30b4719 100644
--- a/arch/arm/dts/rk3288-firefly-u-boot.dtsi
+++ b/arch/arm/dts/rk3288-firefly-u-boot.dtsi
@@ -6,20 +6,9 @@
 #include "rk3288-u-boot.dtsi"
 
 / {
-	config {
-		bootph-all;
-		u-boot,boot-led = "firefly:green:power";
-	};
-
 	leds {
-		bootph-all;
-
-		work {
-			bootph-all;
-		};
-
 		power {
-			bootph-all;
+			default-state = "on";
 		};
 	};
 };
@@ -56,10 +45,6 @@
 	bootph-all;
 };
 
-&gpio8 {
-	bootph-all;
-};
-
 &pcfg_pull_up_drv_12ma {
 	bootph-pre-ram;
 };