arm64: dts: n5x: add qspi, usb, and ethernet support

commit 5165c4c4ac77e57c3153d19bf64c900c7eb9df9a from
https://github.com/altera-opensource/linux-socfpga.git

 socfpga-5.15.30-lts.

[upstream commit f4c35356]

Populate the N5X board dts file with support for QSPI, USB, and
ethernet.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Liwei Song <liwei.song@windriver.com>