drivers/i2c/ptn3460: Use cb_err in mb_adjust_cfg

Return generic coreboot error codes from the mb_adjust_cfg
callback used in mainboards instead of '-1' constant and
a driver-specific success-indicating define.

BUG=none
TEST=Boards siemens/mc_apl{1,4,5,7} and siemens/mc_ehl3
build correctly.

Change-Id: I5e0d4e67703db518ed239a845f43047f569b94ec
Signed-off-by: Jan Samek <jan.samek@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72071
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

0 files changed, 0 insertions, 0 deletions