sconfig: Remove mainboard chip.h support

The mainboard chip.h files were (mostly) removed long ago.

Change-Id: I1d5a9381945427c96868fa17756e6ecabb1048b2
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/16080
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2 files changed