soc/baytrail: add missing USB port defs

Add device/address stub for XHCI USB port 7.
Stub data will be supplemented by board-specific info
added in subsequent commits.

Change-Id: Iae874a9ba01e9428e07cf7ff15e663365b2354a9
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/19972
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/soc/intel/baytrail/acpi/xhci.asl b/src/soc/intel/baytrail/acpi/xhci.asl
index dbd3447..bef0b9f 100644
--- a/src/soc/intel/baytrail/acpi/xhci.asl
+++ b/src/soc/intel/baytrail/acpi/xhci.asl
@@ -27,5 +27,6 @@
 		Device (PRT2) { Name (_ADR, 2) }
 		Device (PRT3) { Name (_ADR, 3) }
 		Device (PRT4) { Name (_ADR, 4) }
+		Device (SSP1) { Name (_ADR, 7) }
 	}
 }