arm64: dts: allwinner: a527: add EMAC0 to Radxa A5E board

On Radxa A5E board, the EMAC0 connect to external Maxio MAE0621A PHY,
which features a 25MHz crystal, and using PH8 pin as PHY reset.

Tested on A5E board with schematic V1.20.

Tested-by: Corentin LABBE <clabbe.montjoie@gmail.com>
Signed-off-by: Yixun Lan <dlan@gentoo.org>
Link: https://patch.msgid.link/20250430-01-sun55i-emac0-v3-4-6fc000bbccbd@gentoo.org


Signed-off-by: Chen-Yu Tsai <wens@csie.org>