siemens/mc_apl1: Add new mainboard

This mainboard is based on Intel's Leafhill CRB with Apollo Lake
silicon. In a first step, it concerns only a copy of intel/leafhill
directory with minimum changes. Special adaptations for MC APL1
mainboard will follow in separate commits.

Change-Id: If0b8a2bc21c99c3be4e6043e8febfb1b91ff0a63
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/18272
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Brenton Dong <brenton.m.dong@intel.com>
12 files changed