mb/system76/adl: Re-enable SATA DevSlp

CB:73353 switched ADL boards from using S0ix to S3. DevSlp can be
reenabled now as it no longer breaks suspend.

Change-Id: I618696833b7ed02e49c35d06021b730be91d879e
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76753
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeremy Soller <jeremy@system76.com>
diff --git a/src/mainboard/system76/adl/devicetree.cb b/src/mainboard/system76/adl/devicetree.cb
index c334839..ad70b05 100644
--- a/src/mainboard/system76/adl/devicetree.cb
+++ b/src/mainboard/system76/adl/devicetree.cb
@@ -69,8 +69,7 @@
 		device ref sata on
 			register "sata_salp_support" = "1"
 			register "sata_ports_enable[1]" = "1" # SSD1
-			# FIXME: DevSlp breaks S0ix
-			#register "sata_ports_dev_slp[1]" = "1" # GPP_H12 (SATA1_DEVSLP1)
+			register "sata_ports_dev_slp[1]" = "1"
 		end
 		device ref pch_espi on
 			register "gen1_dec" = "0x00040069" # EC PM channel