This is needed when ueventd needs to read device tree files
(/proc/device-tree). Prior to acccess, it tries to read
"androidboot.android_dt_dir" from kernel cmdline for a custom
Android DT path.

Bug: 78613232
Test: boot a device without unknown SELinux denials
Change-Id: Iff9c882b4fcad5e384757a1e42e4a1d1259bb574
(cherry picked from commit 98ef2abb)