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>
diff --git a/src/mainboard/google/poppy/variants/nami/devicetree.cb b/src/mainboard/google/poppy/variants/nami/devicetree.cb
index 3db379b..348f7de 100644
--- a/src/mainboard/google/poppy/variants/nami/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nami/devicetree.cb
@@ -27,11 +27,9 @@
 	# FSP Configuration
 	register "ProbelessTrace" = "0"
 	register "EnableLan" = "0"
-	register "EnableSata" = "1"
-	register "SataSalpSupport" = "1"
+	register "EnableSata" = "0"
+	register "SataSalpSupport" = "0"
 	register "SataMode" = "0"
-	register "SataPortsEnable[1]" = "1"
-	register "SataPortsDevSlp[1]" = "1"
 	register "EnableAzalia" = "1"
 	register "DspEnable" = "1"
 	register "IoBufferOwnership" = "3"
@@ -284,7 +282,7 @@
 		device pci 16.2 off end # Management Engine IDE-R
 		device pci 16.3 off end # Management Engine KT Redirection
 		device pci 16.4 off end # Management Engine Interface 3
-		device pci 17.0 on  end # SATA
+		device pci 17.0 off  end # SATA
 		device pci 19.0 on  end # UART #2
 		device pci 19.1 off end # I2C #5
 		device pci 19.2 off end # I2C #4