serial: bcm6858: remove driver and switch to bcm6345

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
diff --git a/arch/arm/dts/bcm6858.dtsi b/arch/arm/dts/bcm6858.dtsi
index 9869d72..d78d34d 100644
--- a/arch/arm/dts/bcm6858.dtsi
+++ b/arch/arm/dts/bcm6858.dtsi
@@ -75,7 +75,7 @@
 		u-boot,dm-pre-reloc;
 
 		uart0: serial@ff800640 {
-			compatible = "brcm,bcm6858-uart";
+			compatible = "brcm,bcm6345-uart";
 			reg = <0x0 0xff800640 0x0 0x18>;
 			clocks = <&periph_osc>;