make permissive setting compatible to boot image version

Bug: 185196274
Test: boot to home with SELinux under permissive mode
Change-Id: I4b521dd765ccbff831cf17c1d9817266b37e6990
diff --git a/factory_common.mk b/factory_common.mk
index c8d0f58..e1d9107 100644
--- a/factory_common.mk
+++ b/factory_common.mk
@@ -52,6 +52,7 @@
 
 # factory should always has SELinux permissive
 BOARD_BOOTCONFIG += androidboot.selinux=permissive
+BOARD_KERNEL_CMDLINE += androidboot.selinux=permissive
 
 # Disable Bluetooth as default in factory build
 DEVICE_PACKAGE_OVERLAYS += device/google/gs101/overlay-factory