rockchip: rock-p-n8/n10: Disable RAM_ROCKCHIP_DEBUG

Disable ram rockchip debug driver for ROCKPi N8/N10 boards
since we have verified ram in many instances with respective
U-Boot versions.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>