remove ro.init.subcontexts_enabled

This is enabled by default now.

Test: treehugger
Change-Id: I95d60ed918c9bd6c4dae6c9d7a36b58cd605043e
diff --git a/device-common.mk b/device-common.mk
index 6d9414e..3df19d2 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -641,6 +641,3 @@
 # Marlin/Sailfish kernel doesn't have HEH filename encryption
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.crypto.volume.filenames_mode=aes-256-cts
-
-PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
-    ro.init.subcontexts_enabled=true