Do not switch to HOME activity when OneTouchPlay API is called

When OneTouchPlay is called, client side wants the current device to
stream its internal source. But this internal source could be Youtube or
Netflix or pure HOME screen. HDMI framework won't be able to tell the
difference here. We should leave this activity switch responsibility to
the client side.

Test: manual
Bug: 131601411
Change-Id: I55afec05462394fbb004a3037bec59ae0a78018e
(cherry picked from commit c7a701ef9a3cbc07afc75efdf9d2a80f5cb82305)