Relabel misc from system_block_device to to misc_block_device.

Bug: 138861550
Test: manual test
Change-Id: I898fdb46a398d296e19a51952d8ba8dbb8720129
diff --git a/shared/sepolicy/vendor/file_contexts b/shared/sepolicy/vendor/file_contexts
index 1d961ef..b09122d 100644
--- a/shared/sepolicy/vendor/file_contexts
+++ b/shared/sepolicy/vendor/file_contexts
@@ -13,8 +13,13 @@
 /dev/block/vda3  u:object_r:cache_block_device:s0
 /dev/block/vda4  u:object_r:metadata_block_device:s0
 /dev/block/vda5  u:object_r:system_block_device:s0
-/dev/block/vda6  u:object_r:system_block_device:s0
 /dev/block/vda7  u:object_r:system_block_device:s0
+
+# crosvm block devices
+/dev/block/pci/pci0000:00/0000:00:01\.0/by-name/misc u:object_r:misc_block_device:s0
+# qemu block devices
+/dev/block/pci/pci0000:00/0000:00:03\.0/by-name/misc u:object_r:misc_block_device:s0
+
 /dev/block/zram0  u:object_r:swap_block_device:s0
 /dev/dri u:object_r:gpu_device:s0
 /dev/dri/card0  u:object_r:graphics_device:s0