board/lx2160a: Add init_func_vid() definition

Add init_func_vid() which calls adjust_vdd()
This ensures adjust_vdd() is called via
init_sequence_f[]

Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>