MAINTAINERS: update edk2 entry.

I want keep an eye on the edk2 things happening in qemu.

Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20210810083450.2377374-2-kraxel@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 694973e..d6c84bd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2947,6 +2947,7 @@
 
 EDK2 Firmware
 M: Philippe Mathieu-Daudé <philmd@redhat.com>
+R: Gerd Hoffmann <kraxel@redhat.com>
 S: Supported
 F: hw/i386/*ovmf*
 F: pc-bios/descriptors/??-edk2-*.json