dt-bindings: mfd: update dlg,da9063.yaml reference

Changeset 441613662db7 ("dt-bindings: mfd: Convert da9063 to yaml")
renamed: Documentation/devicetree/bindings/mfd/da9063.txt
to: Documentation/devicetree/bindings/mfd/dlg,da9063.yaml.

Update its cross-reference accordingly.

Fixes: 441613662db7 ("dt-bindings: mfd: Convert da9063 to yaml")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/da459164d166d994b06f9ce8bf3a2108ccd0abd5.1656234456.git.mchehab@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/devicetree/bindings/input/da9062-onkey.txt

@@ -2,7 +2,7 @@
 
 This module is part of the DA9061/DA9062/DA9063. For more details about entire
 DA9062 and DA9061 chips see Documentation/devicetree/bindings/mfd/da9062.txt
-For DA9063 see Documentation/devicetree/bindings/mfd/da9063.txt
+For DA9063 see Documentation/devicetree/bindings/mfd/dlg,da9063.yaml
 
 This module provides the KEY_POWER event.