dt-bindings: pinctrl: fix bias-pull,up typo

This patch fixes a shared typo in several qcom pinctrl dt-bindings.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>