arm64: dts: marvell: Fix typo in label name on Armada 37xx

The label names of the peripheral clocks have a typo. Fix it before it is
more widely used.
Reported-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-37xx.dtsi

@@ -105,7 +105,7 @@ uart0: serial@12000 {
 				status = "disabled";
 			};
 
-			nb_perih_clk: nb-periph-clk@13000{
+			nb_periph_clk: nb-periph-clk@13000 {
 				compatible = "marvell,armada-3700-periph-clock-nb";
 				reg = <0x13000 0x100>;
 				clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>,
@@ -113,7 +113,7 @@ nb_perih_clk: nb-periph-clk@13000{
 				#clock-cells = <1>;
 			};
 
-			sb_perih_clk: sb-periph-clk@18000{
+			sb_periph_clk: sb-periph-clk@18000 {
 				compatible = "marvell,armada-3700-periph-clock-sb";
 				reg = <0x18000 0x100>;
 				clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>,