ARM: dts: keystone: fix netcp's clocks definitions

The clocks tree for Keystone 2 NTCP devices should be
defined as following:
[refclk] - board dependent
 |- <papllclk> - PLL clock
    |- <paclk13> - fixed factor clock div=3 mul=1
       |- <clkpa> - gated clock
       |- <clkcpgmac> - gated clock
       |- <clksa> - gated clock

Hence, update Keystone 2 DT to follow HW specification.

Signed-off-by: WingMan Kwok <w-kwok2@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
diff --git a/arch/arm/boot/dts/k2l-clocks.dtsi b/arch/arm/boot/dts/k2l-clocks.dtsi
index f584b80..eb1e3e2 100644
--- a/arch/arm/boot/dts/k2l-clocks.dtsi
+++ b/arch/arm/boot/dts/k2l-clocks.dtsi
@@ -31,7 +31,7 @@
 		#clock-cells = <0>;
 		compatible = "ti,keystone,pll-clock";
 		clocks = <&refclksys>;
-		clock-output-names = "pa-pll-clk";
+		clock-output-names = "papllclk";
 		reg = <0x02620358 4>;
 		reg-names = "control";
 	};