linux-imx

MAINTAINERS: remove maintainship entry of docking station driver

As Rafael suggested, docking station driver is maintained along with the
ACPI core nowadays, so it's better to remove this entry.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>