input: touchpanel: Release all touches during suspend

Release all the touches before going to suspend to avoid
sticky touches and correct multitouch ID error.

  This patch is propagated from 3.4 kernel
    commit: 63ad82b46cac81a330aa7628fe97bc7b371d091e
    input: touchpanel: Release all touches during suspend

Change-Id: I5dd84d44478291e16fd577aad5cf06503e44fbde
Signed-off-by: Figo Wang <figow@codeaurora.org>