x86: AMD microcode patch loading support v2

Add an entry to the MAINTAINERS file for AMD CPU microcode
patch loading support.
Signed-off-by: NPeter Oruba <peter.oruba@amd.com>
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

MAINTAINERS

@@ -384,6 +384,11 @@ M:	joerg.roedel@amd.com
 L:	iommu@lists.linux-foundation.org
 S:	Supported
 
+AMD MICROCODE UPDATE SUPPORT
+P:      Peter Oruba
+M:      peter.oruba@amd.com
+S:      Supported
+
 AMS (Apple Motion Sensor) DRIVER
 P:	Stelian Pop
 M:	stelian@popies.net