Remove sys.vdso property

This is an experimental property on Q and doesn't need anymore.

Exempt-From-Owner-Approval: cherry-pick

Bug: 154885206
Test: N/A
Change-Id: I80415edc002345849b375e07fdf5783cf60c2446
Merged-In: I80415edc002345849b375e07fdf5783cf60c2446
(cherry picked from commit 7b59ae50e61c603a3162c8270ed6c4037731e5c2)
diff --git a/private/property_contexts b/private/property_contexts
index 391511d..f0e2ded 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -514,7 +514,6 @@
 
 sys.retaildemo.enabled  u:object_r:exported3_system_prop:s0 exact int
 sys.user.0.ce_available u:object_r:exported3_system_prop:s0 exact bool
-sys.vdso                u:object_r:exported3_system_prop:s0 exact string
 
 sys.usb.config   u:object_r:exported_system_radio_prop:s0 exact string
 sys.usb.configfs u:object_r:exported_system_radio_prop:s0 exact int