rockchip: rk3566-pinetab2: Migrate to OF_UPSTREAM

The device tree for Pine64 PineTab2 has been merged into dts/upstream
with devicetree-rebasing v6.10-dts, migrate board to OF_UPSTREAM.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
4 files changed