arm64: dts: qcom: sc7180-trogdor: Simplify SAR sensor enabling

The SAR node, ap_sar_sensor, needs to be enabled in addition to the i2c
bus it resides on. Let's simplify this by leaving the sensor node
enabled by default while leaving the i2c bus disabled by default. On
boards that use the sensor, we already enable the i2c bus so we can
simply remove the extra bit that enables the sar sensor node. This saves
some lines but is otherwise a non-functional change.

Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220325211640.54228-1-swboyd@chromium.org