mb/system76/lemp9: Add comments to SATA ports

Change-Id: I8db3bfbdb557a84413408b4b39a13b24c45497cc
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45120
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner

src/mainboard/system76/lemp9/devicetree.cb

@@ -173,8 +173,10 @@ chip soc/intel/cannonlake
 		device pci 17.0 on	# SATA
 			register "SataMode" = "Sata_AHCI"
 			register "SataSalpSupport" = "0"
+			# Port 2 (J_SSD2)
 			register "SataPortsEnable[1]" = "1"
 			register "SataPortsDevSlp[1]" = "1"
+			# Port 3 (J_SSD1)
 			register "SataPortsEnable[2]" = "1"
 			register "SataPortsDevSlp[2]" = "1"
 		end