imx: kontron-sl-mx8mm: Remove 100mt DDR setpoint

The new stable configuration is missing the 100mt setpoint, remove
it before updating the config to make sure the changes are separated
cleanly.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
3 files changed