AsoC: msm: Change hostless mode switch name

Regular audio playback is failing after kernel 3.0 upgrade
until unless hostless switch is renamed
The hostless mode switch name is currently same as back-end
AIF and new DAPM search logic in kernel 3.0 finds the route
entry for hostless pcm to slimbus Rx backend with "Switch"
as control word first. If switch is not on, it considers as
source and sink are not joined and playback fails
Hence hostless mode switch name had to be renamed to allow
both regular playback and hostless mode playback to work on
3.0 kernel

Change-Id: I3767899110f3d48b8de312fa91c61ce68f15b56b
CRs-Fixed: 313673
Signed-off-by: Sriranjan Srikantam <cssrika@codeaurora.org>