mcf: Don't pass first MACHINE in global replacements (v4.0.13)

:Release Notes:
Multiple MACHINE-s weren't configured correctly.

:Detailed Notes:
process_file is handling 2 MACHINE-specific replacements
@machine@ and @abs_builddir@ having another @machine@ replacement
in global variable was causing 2nd MACHINE having the 1st one in
local.conf MACHINE assignment.

:Testing Performed:
Only build tested.

:QA Notes:
No change to image.

:Issues Addressed:

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: I7f10ac5778cfc8bf115335e0aff37791195363a0
Reviewed-on: https://g2g.palm.com/6171
Reviewed-by: DCO Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>