arm64: dts: uniphier: remove unnecessary interrupt-parent

These were added to make the ARM64 branch self-contained because
updates for ARM and ARM64 are supposed to be sent as separate
pull requests.

Now, they were merged together in Linus' tree and interrupt-parent
from the arch/arm/boot/dts/uniphier-support-card.dtsi is visible from
ARM64 DT files by the cross-arch reference.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm64/boot/dts/socionext/uniphier-ld11-ref.dts

@@ -40,7 +40,6 @@ memory@80000000 {
 };
 
 &ethsc {
-	interrupt-parent = <&gpio>;
 	interrupts = <0 8>;
 };
 

arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts

@@ -40,7 +40,6 @@ memory@80000000 {
 };
 
 &ethsc {
-	interrupt-parent = <&gpio>;
 	interrupts = <0 8>;
 };
 

arch/arm64/boot/dts/socionext/uniphier-pxs3-ref.dts

@@ -38,7 +38,6 @@ memory@80000000 {
 };
 
 &ethsc {
-	interrupt-parent = <&gpio>;
 	interrupts = <4 8>;
 };