Use /proc/device-tree for reading AVF DT
Although /proc/device-tree is symlink to /sys/firmware/devicetree/base,
/proc/device-tree is the stable API but the absolute path may be
changed in the future.
Bug: 322465386
Test: atest CustomPvmfwHostTestCases
Change-Id: I0d55918b6ec4563135c596649ccfd4bd84284963
diff --git a/microdroid/fstab.microdroid b/microdroid/fstab.microdroid
index 2742757..3209442 100644
--- a/microdroid/fstab.microdroid
+++ b/microdroid/fstab.microdroid
@@ -2,4 +2,4 @@
# This is a temporary solution to unblock other devs that depend on /vendor partition in Microdroid
# The /vendor partition will only be mounted if the kernel cmdline contains
# androidboot.microdroid.mount_vendor=1.
-/dev/block/by-name/microdroid-vendor /vendor ext4 noatime,ro,errors=panic wait,first_stage_mount,avb_hashtree_digest=/sys/firmware/devicetree/base/avf/vendor_hashtree_descriptor_root_digest
+/dev/block/by-name/microdroid-vendor /vendor ext4 noatime,ro,errors=panic wait,first_stage_mount,avb_hashtree_digest=/proc/device-tree/avf/vendor_hashtree_descriptor_root_digest