MAINTAINERS: Add maintainer for ARC PGU display controller

This updates MAINTEINERS file with information about maintainer of
ARC PGU display controller driver.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: linux-snps-arc@lists.infradead.org

MAINTAINERS

@@ -847,6 +847,12 @@ S:	Maintained
 F:	drivers/net/arcnet/
 F:	include/uapi/linux/if_arcnet.h
 
+ARC PGU DRM DRIVER
+M:	Alexey Brodkin <abrodkin@synopsys.com>
+S:	Supported
+F:	drivers/gpu/drm/arc/
+F:	Documentation/devicetree/bindings/display/snps,arcpgu.txt
+
 ARM HDLCD DRM DRIVER
 M:	Liviu Dudau <liviu.dudau@arm.com>
 S:	Supported