arm64: dts: ls1028a-qds: enable lpuart1

LPUART nodes by default are disabled in LS1028A device
tree, Enabling LPUART1 node.

Signed-off-by: Vabhav Sharma <vabhav.sharma@nxp.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>