Rename APEX Namespace

Current APEX Namespace is named with APEX name itself, which also uses
.(dot) so linker configuration can keep the syntax safe.

Bug: 148826508
Test: m -j passed
Test: boot succeeded from cuttlefish and walleye
Change-Id: Icc1c5958fcbcceb6f53ad18045cf783e315ebbb0
1 file changed