ARM: dts: rk3328: Enable VOP for bootph-all

Model: Firefly roc-rk3328-cc
DRAM: 1 GiB (effective 1022 MiB)
Video device 'vop@ff370000' cannot allocate frame buffer memory -ensure the device is set up before relocation
Error binding driver 'rockchip_rk3328_vop': -28
Some drivers failed to bind
initcall sequence 000000003ffcd5e8 failed at call 000000000021a5c4 (err=-28)
 ### ERROR ### Please RESET the board ###

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>