power: rk3399: Use longer SYS_RST hold time on chipset reset
power: rk3399: Use longer SYS_RST hold time on chipset reset

BUG=chrome-os-partner:57990
BRANCH=gru
TEST=On kevin, verify `apreset` and kernel panic cause successful AP
reset.

Change-Id: Ic5ad2fd2d2d08ae32a60314e30f4cdff061da164
Signed-off-by: Shawn Nematbakhsh <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/395533
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
(cherry picked from commit 8fb0dedd8daebeca3757bc341d0a5355d3b26ba5)
Reviewed-on: https://chromium-review.googlesource.com/396136
Commit-Ready: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Tested-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
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