Removed RRC_MAC_SYNC_IND that is not used anymore.
Added ITTI messages reception in PDCP (in pdcp_run).
Added pdcp_rrc_data_req in l2 interface.
Fixed warning.

pre-ci ok.

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4290 818b1a75-f10b-46b9-bf7c-635c3b92a50f