Deepshortcuts - only keep the per package shortcut count in memory.

Change to only keep the per Activity shortcut count in memory, not
the list of ids.
The full shortcuts are loaded at long press time so saves memory.

Bug:117239104
Test:Manual and ran instrumentation tests
Change-Id: Iee974ecba2c977216be4f078396ceed22b931f5d
12 files changed