Specify SYS_ADMIN capability for authfs_service

Bug: 243633980
Test: presubmit
Change-Id: I906a2acf9ccc5a347019abd9014510115645343e
diff --git a/authfs/service/authfs_service.rc b/authfs/service/authfs_service.rc
index 7edb1ca..409e91c 100644
--- a/authfs/service/authfs_service.rc
+++ b/authfs/service/authfs_service.rc
@@ -1,3 +1,5 @@
 service authfs_service /system/bin/authfs_service
     disabled
     socket authfs_service stream 0666 root system
+    # SYS_ADMIN capability allows to mount FUSE filesystem
+    capabilities SYS_ADMIN