x86: Remove alex.dts in arch/x86/dts

No board is using alex.dts, so remove it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/dts/Makefile

@@ -1,6 +1,5 @@
 dtb-y += link.dtb \
 	chromebook_link.dtb \
-	alex.dtb \
 	crownbay.dtb
 
 targets += $(dtb-y)

arch/x86/dts/alex.dts

@@ -1,24 +0,0 @@
-/dts-v1/;
-
-/include/ "coreboot.dtsi"
-
-/ {
-	#address-cells = <1>;
-	#size-cells = <1>;
-	model = "Google Alex";
-	compatible = "google,alex", "intel,atom-pineview";
-
-	config {
-	       silent_console = <0>;
-	};
-
-	gpio: gpio {};
-
-	serial {
-		reg = <0x3f8 8>;
-		clock-frequency = <115200>;
-	};
-
-	chosen { };
-	memory { device_type = "memory"; reg = <0 0>; };
-};