CHROMIUM: arm64: dts: Set 6000 uV/uS ramp for rk3399-gru DVS rails

Although we haven't yet scoped it yet, it's clear that ramping the DVS
rails on rk3399-gru won't be instant.  Until we get a chance to scope,
let's try setting 6000 uV/uS as the ramp rate.  Times for ramping now
will be:
  800000 uV => 1025000 uV: 37.5 uS

BUG=chrome-os-partner:54814
TEST=Reboot tests become much more stable.

Change-Id: I3a4115ed8db3eca6c0001c738a1ccd442ce4465f
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/356510
Reviewed-by: Derek Basehore <dbasehore@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
1 file changed