board: lx2160a: Align RD tables address to 64KB

As the lower 16bit of the redistributor pending table is reserved
for describing the memory attributes, we must give a 64KB aligned
address to the GIC LPI initialization function.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Wasim Khan <wasim.khan@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>