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>

MAINTAINERS

@@ -3272,12 +3272,6 @@ F:	drivers/firmware/dmi-id.c
 F:	drivers/firmware/dmi_scan.c
 F:	include/linux/dmi.h
 
-DOCKING STATION DRIVER
-M:	Shaohua Li <shaohua.li@intel.com>
-L:	linux-acpi@vger.kernel.org
-S:	Supported
-F:	drivers/acpi/dock.c
-
 DOCUMENTATION
 M:	Jonathan Corbet <corbet@lwn.net>
 L:	linux-doc@vger.kernel.org