arm64: dts: ls1028a: fix gpio nodes

Update the nodes to include little-endian
property to be consistent with the hardware.

Signed-off-by: Song Hui <hui.song_1@nxp.com>
Acked-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>