dt-bindings: pinctrl: aspeed-g6: remove FWQSPID group

FWQSPID is not a group of FWSPID so remove it.

Fixes: 7488838f

 ("dt-bindings: pinctrl: aspeed: Document AST2600 pinmux")
Signed-off-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220329173932.2588289-4-quic_jaehyoo@quicinc.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>