MAINTAINERS: Update maintainers for Guest x86 HAXM CPUs

Clean up the maintainer list.

Reviewed-by: Hang Yuan <hang.yuan@intel.com>
Signed-off-by: Wenchao Wang <wenchao.wang@intel.com>
Message-Id: <DM6PR11MB4090A58ACCA4AD8C752AEEA587199@DM6PR11MB4090.namprd11.prod.outlook.com>
[thuth: Note: Colin Xu's address bounces]
Signed-off-by: Thomas Huth <thuth@redhat.com>

MAINTAINERS

@@ -488,7 +488,6 @@ Guest CPU Cores (HAXM)
 ---------------------
 X86 HAXM CPUs
 M: Wenchao Wang <wenchao.wang@intel.com>
-M: Colin Xu <colin.xu@intel.com>
 L: haxm-team@intel.com
 W: https://github.com/intel/haxm/issues
 S: Maintained