Braswell: Separate L1 Sub State init procedure for boards.

Original-Reviewed-on: https://chromium-review.googlesource.com/312743
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Signed-off-by: Kenji Chen <kenji.chen@intel.com>

Change-Id: Ib0a891f229477cf359bff6cd02f305606468f07f
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Signed-off-by: Kenji Chen <kenji.chen@intel.com>
Reviewed-on: https://review.coreboot.org/12750
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/intel/strago/Kconfig b/src/mainboard/intel/strago/Kconfig
index f23a86c..6587d5a 100755
--- a/src/mainboard/intel/strago/Kconfig
+++ b/src/mainboard/intel/strago/Kconfig
@@ -13,6 +13,7 @@
 	select MAINBOARD_HAS_CHROMEOS
 	select MAINBOARD_HAS_LPC_TPM
 	select SOC_INTEL_BRASWELL
+	select PCIEXP_L1_SUB_STATE
 
 config CHROMEOS
 	select LID_SWITCH