sm8450-common: Remove wait_for_keymaster and all references

No longer needed now init listens for property changes on a
separate thread.

Bug: 186580823
Test: Cuttlefish boots successfully
Change-Id: Ief3a546d2154231d18957c2f703bd128966d7288

rootdir/etc/init.target.rc

@@ -91,8 +91,6 @@ on post-fs
     setrlimit 8 67108864 67108864
 
 on late-fs
-    wait_for_prop hwservicemanager.ready true
-    #exec_start wait_for_keymaster
     mount_all /vendor/etc/fstab.qcom --late
 
 on post-fs-data