Add wimax_manager to Platform2

BUG=chromium:220003
TEST=Run ALL the trybots
CQ-DEPEND=CL:56290

Change-Id: I39d8d39ee84fe92fea6183754e5ec104b078ca23
Reviewed-on: https://chromium-review.googlesource.com/63785
Reviewed-by: Mike Frysinger <[email protected]>
Tested-by: Liam McLoughlin <[email protected]>
Commit-Queue: Liam McLoughlin <[email protected]>
8 files changed