mc_tcu3: Remove all hwinfo files from mainboard directory

To unify the hwinfo handling along all Siemens MC boards the hwinfo
files have to be removed from the mainboard directory. They will be added
to cbfs in site-local/Makefile.inc.

Change-Id: Ia3dcb2e0118527b37aed872740273c4fa7004aef
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/19982
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
6 files changed