arm64: dts: allwinner: correct the model name for Radxa Cubie A5E

arm64: dts: allwinner: correct the model name for Radxa Cubie A5E

According to https://radxa.com/products/cubie/a5e,
the name of this board should be "Radxa Cubie A5E".
This is also consistent with the dt-bindings.

Fixes: 80e0fb4e491b ("arm64: dts: allwinner: a523: add Radxa A5E support")
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://patch.msgid.link/20250416100006.82920-1-amadeus@jmu.edu.cn
Signed-off-by: Chen-Yu Tsai <wens@csie.org>