mb/google/poppy/variants/nami: Disable SATA

This change disables SATA controller in order to make SATA IP enter
low power status.

BUG=b:72332817
TEST=cat /sys/kernel/debug/pmc_core/pch_ip_power_gating_status
     and verify SATA IP enters low power state

Change-Id: I72a98bc3d0b47aebc0d7be534f4a7503084b257f
Signed-off-by: Kane Chen <kane.chen@intel.com>
Reviewed-on: https://review.coreboot.org/23354
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed