Modify IME interface to pass LS2 handle instead of mainloop

Note: This requires matching change in luna-sysmgr and keyboard-efigs

Open-webOS-DCO-1.0-Signed-off-by: Roger Stringer <roger.stringer@lge.com>

Change-Id: If72e1b5d873ade47279f2e9875a383014aaa0930