Turn selinux off temporarily for microdroid

For some unknown reason, microdroid is experiencing selinux denials
although we provided the correct policy files. Until the cause is found
and fixed, let's disable selinux.

Bug: 181728474
Bug: 181747352
Test: boot microdroid
Change-Id: I466c0eb88d4b3ce6a2cca73252e15f53a401cab7
diff --git a/microdroid/uboot-env.txt b/microdroid/uboot-env.txt
index 44b39e2..d845086 100644
--- a/microdroid/uboot-env.txt
+++ b/microdroid/uboot-env.txt
@@ -4,7 +4,7 @@
 bootcmd=boot_android virtio 0#misc
 
 # Kernel commandlines
-bootargs=rdinit=/bin/init_vendor panic=-1 androidboot.first_stage_console=1 androidboot.hardware=microdroid androidboot.boot_devices=10000.pci
+bootargs=rdinit=/bin/init_vendor panic=-1 androidboot.first_stage_console=1 androidboot.hardware=microdroid androidboot.boot_devices=10000.pci androidboot.selinux=permissive
 
 bootdelay=0
 fdtaddr=0x80000000