intel_mid: Added custom handler for ipc devices

Added a custom handler for medfield based ipc devices and
moved devs_id structure defintion to header file.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Link: http://lkml.kernel.org/r/1382049336-21316-9-git-send-email-david.a.cohen@linux.intel.com


Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>