Allow cross-profile interaction when called from the system process.

This is done by allowing INTERACT_ACROSS_USERS_FULL to interact
cross-profile and make system_server use INTERACT_ACROSS_USERS_FULL.

Bug: 148279634
Test: manually verified the icons are loading cross-profile
Test: atest ManagedProfileTest#testCanGetWorkShortcutIconDrawableFromPersonalProfile
Test: atest ManagedProfileTest#testCanGetPersonalShortcutIconDrawableFromWorkProfile

Change-Id: I8da69a7cabd00bc3422cdd53af35604c248029af