i9300: use unified init.smdk4x12.rc

Change-Id: I8a09a9f63d72d261b1cad647438194b30a9d20e8
(cherry picked from commit b0884d62ccbb35ac38d9a1028c1c9d97c265229c)
i9300: add selinux policies

Change-Id: I0304c2efeb06b583a28ea9c9dcc874254ee3930f
(cherry picked from commit 2aa1146201ea9b422f7c72c01250f415ef712c4a)
i9300: audio: disable voicecall route on init and leaving incall state

Change-Id: I5e1ca99f19a715ef509825d46103c60f10d35ce2
(cherry picked from commit cef9ffb50b2742916fda2f9d5862c3c08362722b)
i9300: selinux: remove vold rules

moved to external/sepolicy

Change-Id: I829824e38b0a98989b35acbfc89ea225b9ce198b
(cherry picked from commit 0c05b46c012c70064e9ebfbe21f04321f766911c)