power/rk3399: Don't turn off the pp900_s0 during s3
power/rk3399: Don't turn off the pp900_s0 during s3

The PP900_LOGIC can't be disabled for now, maybe we will disable it in
later,  since the ATF hadn't done it.
In order to the suspend to resume function is fine, let's keep it first.

BRANCH=none
BUG=b:65270978
TEST=build and run the S2R stress tests on nefario board

Change-Id: I932ee2b7667115df7516729f60faa71598f36d93
Signed-off-by: Caesar Wang <6a97ab1d8fae3a62719c8e695586fe709398a94a@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/647053
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec