FUSE-BPF: use both ro and persist properties

persist.sys.fuse.bpf.enable and ro.fuse.bpf.enabled are both used to
decide if FUSE-BPF must be enabled or not.
- ro.fuse.bpf.enabled is a read-only property that is set in the device
  makefile and would allow dogfooding devices to turn the feature
  on/off.
- persist.sys.fuse.bpf.enable is a system property that overrides
  ro.fuse.bpf.enabled and can only be set manually during the
  development to simplify the testing of FUSE-BPF, mostly to compare if
  those tests that are failing with FUSE-BPF were failing also without
  the feature.

Bug: 202785178
Test: adb logcat | grep "FuseDaemon" | grep BPF
Ignore-AOSP-First: FUSE-BPF is not available in AOSP
Signed-off-by: Alessio Balsini <balsini@google.com>
Change-Id: I23f9d27172907f6c72c73bea22e4a7e0ac643888