MAINTAINERS: add entry for auxiliary bus

When auxiliary bus was added to the kernel the MAINTAINERS file wasn't
updated with a mention of the files, contributors and reviewers. Fix
that oversight by adding Dave and Ira, with GregKH as (same as current)
owner.

CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: Dave Ertman <david.m.ertman@intel.com>
Acked-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20230511164501.3859674-1-jesse.brandeburg@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: jbrandeb

MAINTAINERS

@@ -3383,6 +3383,16 @@ F:	include/uapi/linux/audit.h
 F:	kernel/audit*
 F:	lib/*audit.c
 
+AUXILIARY BUS DRIVER
+M:	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+R:	Dave Ertman <david.m.ertman@intel.com>
+R:	Ira Weiny <ira.weiny@intel.com>
+S:	Supported
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
+F:	Documentation/driver-api/auxiliary_bus.rst
+F:	drivers/base/auxiliary.c
+F:	include/linux/auxiliary_bus.h
+
 AUXILIARY DISPLAY DRIVERS
 M:	Miguel Ojeda <ojeda@kernel.org>
 S:	Maintained