arm64: dts: r8a7795: Mark EthernetAVB device node disabled

arm64: dts: r8a7795: Mark EthernetAVB device node disabled

BugLink: http://bugs.launchpad.net/bugs/1691369
commit 0d1390ff283f6c38595288e7f74da6829896b8b7 upstream.

Device nodes representing I/O devices should be marked disabled in the
SoC-specific DTS, and overridden by board-specific DTSes where needed.

Fixes: a92843c8a6f8c039 ("arm64: dts: r8a7795: add EthernetAVB device node")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>