ARM: dts: am437x: add aliases for all UART instances

Add serialN aliases for all 6 UART instances on
the AM437x SoC so each board's .dts file does not
have to define its own aliases.

Remove the alias added for am437x-gp-evm.dts now
that we have the aliases defined in am4372.dtsi
file.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am4372.dtsi

@@ -23,6 +23,11 @@
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;
 		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+		serial3 = &uart3;
+		serial4 = &uart4;
+		serial5 = &uart5;
 		ethernet0 = &cpsw_emac0;
 		ethernet1 = &cpsw_emac1;
 	};

arch/arm/boot/dts/am437x-gp-evm.dts

@@ -21,7 +21,6 @@
 
 	aliases {
 		display0 = &lcd0;
-		serial3 = &uart3;
 	};
 
 	evm_v3_3d: fixedregulator-v3_3d {