MAINTAINERS: EDAC/armada_xp: include dt-bindings

Include dt-bindings for Marvell Armada XP SDRAM in the EDAC-ARMADA
entry.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210817093807.59531-2-krzysztof.kozlowski@canonical.com

MAINTAINERS

@@ -6559,6 +6559,7 @@ EDAC-ARMADA
 M:	Jan Luebbe <jlu@pengutronix.de>
 L:	linux-edac@vger.kernel.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/memory-controllers/marvell,mvebu-sdram-controller.yaml
 F:	drivers/edac/armada_xp_*
 
 EDAC-AST2500