dt-bindings: gpio: aspeed: Remove reference to clock name

HPLL is in fact not the clock we need. Remove prescription of which clock to
avoid further error. Please refer to your datasheet and double check like I
should have.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/gpio/gpio-aspeed.txt

@@ -18,7 +18,7 @@ Required properties:
 Optional properties:
 
 - interrupt-parent      : The parent interrupt controller, optional if inherited
-- clocks                : A phandle to the HPLL clock node for debounce timings
+- clocks                : A phandle to the clock to use for debounce timings
 
 The gpio and interrupt properties are further described in their respective
 bindings documentation: