ARM: shmobile: r8a7740 dtsi: Remove duplicate interrupt-parent property

ARM: shmobile: r8a7740 dtsi: Remove duplicate interrupt-parent property

Caused by interaction between commit
08ec67b50db7ca8c9077e67ca23850cdc5bfc716 ("ARM: shmobile: r8a7740 dtsi:
Add Ethernet support") and commit 9ff254adc1e32db46000a33b8ecbc4d7047672be
("ARM: shmobile: dts: Move interrupt-parent property to root node").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 3fa3985e624aea24334abc9a33b484c3d316e64e)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>