MAINTAINERS: Update maintainer for dcdbas and dell_rbu

Assign maintainer for dell_rbu driver, and reassign maintainer of dcdbas
from inactive maintainer (current maintainer is aware of this change--
see https://www.spinics.net/lists/platform-driver-x86/msg16336.html).

Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>
Acked-by: Doug Warzecha <Douglas_Warzecha@dell.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

MAINTAINERS

@@ -4187,6 +4187,12 @@ M:	Pali Rohár <pali.rohar@gmail.com>
 S:	Maintained
 F:	drivers/platform/x86/dell-rbtn.*
 
+DELL REMOTE BIOS UPDATE DRIVER
+M:	Stuart Hayes <stuart.w.hayes@gmail.com>
+L:	platform-driver-x86@vger.kernel.org
+S:	Maintained
+F:	drivers/platform/x86/dell_rbu.c
+
 DELL LAPTOP SMM DRIVER
 M:	Pali Rohár <pali.rohar@gmail.com>
 S:	Maintained
@@ -4194,10 +4200,11 @@ F:	drivers/hwmon/dell-smm-hwmon.c
 F:	include/uapi/linux/i8k.h
 
 DELL SYSTEMS MANAGEMENT BASE DRIVER (dcdbas)
-M:	Doug Warzecha <Douglas_Warzecha@dell.com>
+M:	Stuart Hayes <stuart.w.hayes@gmail.com>
+L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
 F:	Documentation/dcdbas.txt
-F:	drivers/firmware/dcdbas.*
+F:	drivers/platform/x86/dcdbas.*
 
 DELL WMI NOTIFICATIONS DRIVER
 M:	Matthew Garrett <mjg59@srcf.ucam.org>