gs101: Use FUSE passthrough by default

Enable the persist.sys.fuse.passthrough.enable flag for the P21 device
configuration to enable the FUSE passthrough feature.
This feature has been enabled on Cuttlefish, Wembley and Redbull devices for
months and no issues have been detected yet.

Bug: 168023149
Test: 'adb shell getprop | grep persist.sys.fuse.passthrough.enable',
    ScopedStorageTest
Signed-off-by: Alessio Balsini <balsini@google.com>
Change-Id: I3f39b02af436f7e508bb70efc702565a667a051c
diff --git a/device.mk b/device.mk
index 3acf0fc..416695f 100644
--- a/device.mk
+++ b/device.mk
@@ -834,6 +834,10 @@
 # Dynamic Partitions
 PRODUCT_USE_DYNAMIC_PARTITIONS := true
 
+# Use FUSE passthrough
+PRODUCT_PRODUCT_PROPERTIES += \
+	persist.sys.fuse.passthrough.enable=true
+
 # Use /product/etc/fstab.postinstall to mount system_other
 PRODUCT_PRODUCT_PROPERTIES += \
 	ro.postinstall.fstab.prefix=/product