arm64: dts: qcom: apq8016-sbc: fix mpps state names

The majority of device tree nodes for mpps use xxxx-state as pinctrl
nodes. Change names of mpps pinctrl nodes for the apq8016-sbc board to
follow that pattern.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211008012524.481877-13-dmitry.baryshkov@linaro.org