Migrate smartspace as a widget and smartspace removal toggle flags to aconfig

Bug: 336823684, 336823681
Test: none
Flag: ACONFIG enable_smartspace_as_a_widget DISABLED
Flag: ACONFIG enable_smartspace_removal_toggle DISABLED
Change-Id: I4cba42e09f58365f761ab866b15a494817e6bb0f
17 files changed