libprocessgroup: Disable file descriptor caching temporarily

File descriptor caching breaks boot on Android Go and Svelte targets.
Disable it temporarily to fix the builds and investigate the root cause
further.

Bug: 123868658
Test: Android Go device boots after this change

Change-Id: Idd0209029cde8454ea99b9de030f7a317c2988d7
Signed-off-by: Suren Baghdasaryan <surenb@google.com>