Disable SystemFeaturesCache in cmd-like system processes

A handful of "system" command processes are neither bound as
applications, nor are they system_server. As such, they don't
go through the usual initialization routines, which includes
installation of ApplicationSharedMemory.

For now, disable use of the dependent SystemFeaturesCache for such
processes.

Bug: 400713460
Test: `adb shell svc nfc` succeeds without crashing
Test: atest SystemFeaturesCacheTest
Flag: android.content.pm.cache_sdk_system_features
Change-Id: I0e9b67d1cfe4552f08babf80b6a2862530221d32