Refactored board files

Refactored board files

BZ:28671

Board files for different platforms have lot of common code, hence
to avoid code duplication we have re-factored the current board
file structure into following.

For each device we have created a separate platform_*device_name*.c,h
files.

platform_*device_name*.c - Contains device init and helper
			   functions.
platform_*device_name*.h - Contains extern declaration of init
			   function.

Compilation of these platform files are controlled using corresponding
driver CONFIG options.

To use these devices, In board files we will have to just include the
header file and add reference to the device init function in the
device_id structure.

Change-Id: I28f8add6f9ba96dcc6513cffe856cd2c487d09ee
Signed-off-by: sathyanarayanan kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
Reviewed-on: http://android.intel.com:8080/40278
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Tested-by: Yang, Fei <fei.yang@intel.com>
Reviewed-by: Monroy, German <german.monroy@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Reviewed-by: Wood, Brian J <brian.j.wood@intel.com>
Tested-by: Wood, Brian J <brian.j.wood@intel.com>
Tested-by: Ng, Cheon-woei <cheon-woei.ng@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>