MAINTAINERS: Add an entry for OpenSBI firmware

List me as the maintainer for OpenSBI firmware related files.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <1593177220-28143-1-git-send-email-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index fe8139f..80fa883 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2681,6 +2681,13 @@
 F: hw/i386/intel_iommu_internal.h
 F: include/hw/i386/intel_iommu.h
 
+OpenSBI Firmware
+M: Bin Meng <bmeng.cn@gmail.com>
+S: Supported
+F: pc-bios/opensbi-*
+F: .gitlab-ci.d/opensbi.yml
+F: .gitlab-ci.d/opensbi/
+
 Usermode Emulation
 ------------------
 Overall usermode emulation