s4-common: Don't assign garbage groups

Change-Id: Idbca017ef2eb2a2cf5fe85304f0d4591e09e4c09
s4-common: Remove unused init entries and scripts

Change-Id: I5e56d11186ff5524db9880004ddc361b99ad07bf
s4-common: Move directory creation to post-fs-data

Change-Id: I4d765af371b2ada5bbab16aa2e336637714b8863
s4-common: Use wcnss_service to initialize wifi

Change-Id: Ia98a0048f3c7b7fee29d2df34b5fa1b128169ecb