arm64: dts: qcom: qrb5165-rb5: enabled pwrkey and resin nodes

Enable powerkey and resin nodes to let the board handle POWER and
Volume- keys properly.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Tested-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210916151341.1797512-3-dmitry.baryshkov@linaro.org