rockchip: rk3399: improve sdram noc timing

sdram noc timing will affect ddr latency, this patch improve
rk3399 sdram noc timing so improve memory performance.

BRANCH=gru
BUG=chrome-os-partner:57248
TEST=Boot from kevin board

Change-Id: I393e74ecdeb72930ac38ae9bcf311e5654f65162
Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/382725
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: Sonny Rao <sonnyrao@chromium.org>
Commit-Queue: Sonny Rao <sonnyrao@chromium.org>
6 files changed