arm64: dts: qcom: sc8280xp-x13s: drop bogus 'input-enable'

The sc8280xp pin controller does not have a way to enable or disable the
input buffer so drop the unnecessary 'input-enable' property which is
about to be deprecated.

Link: https://lore.kernel.org/lkml/20230323102605.6.I291ce0ba2c6ea80b341659c4f75a567a76dd7ca6@changeid


Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230327123243.4527-1-johan+linaro@kernel.org