intel/kunimitsu: Power gate Kepler device

This patch power gates the Kepler module
on skylake kunimitsu board. This is required
to save power since this is consuming over 500mw
of power in all active use cases.
The device can be powered on later by using the
kernel driver as required by setting the
kepler enable gpio high.

BRANCH=None
BUG=chrome-os-partner:45962
TEST=Build and Boot Kunimitsu and check lspci.
The Kepler device should not be listed.
Also power measurement of board should give
approximately 300mW of reduction in power.

Change-Id: I244a23385e20ef1431dc895536c8a47e1f5770d7
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 8d4fb7d01f32ac307a351c307b8461628c0e5414
Original-Change-Id: Idafa74d7ff14d67a5b1e635f783efd84b5a7399c
Original-Signed-off-by: Pravin Angolkar <pravin.k.angolkar@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/302277
Original-Commit-Ready: Naveenkrishna Ch <naveenkrishna.ch@intel.com>
Original-Tested-by: Pravin K Angolkar <pravin.k.angolkar@intel.com>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/12964
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

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