dt-bindings: memory-controllers: ti,gpmc: fix typo in description

Fix typo where 'GPMC driver implements an interrupt controller' instead of
'and interrupt controller'
Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Link: https://lore.kernel.org/r/20221222182309.575069-1-colin.foster@in-advantage.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml

@@ -90,7 +90,7 @@ properties:
 
   interrupt-controller:
     description: |
-      The GPMC driver implements and interrupt controller for
+      The GPMC driver implements an interrupt controller for
       the NAND events "fifoevent" and "termcount" plus the
       rising/falling edges on the GPMC_WAIT pins.
       The interrupt number mapping is as follows