Add flash_node to the rockchip_nfc driver chip structure in order
to find the partitions in the add_mtd_partitions_of() function.
Signed-off-by: Johan Jonker <jbx6244@gmail.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>