mgcp_e1: do not expose function  mgcp_e1_init()

The initialization of the E1 line in mgcp_e1.c is controlled internally,
there is no need to expose the function mgcp_e1_init(), lets make it
static and remove the prefix mgcp_

Change-Id: I6aba1c55c9b1d729709ee1fba2994c77bd848a9b
2 files changed