arm64: dts: qcom: qrb4210-rb2: Enable on-board buttons

Enable the PMIC GPIO- and RESIN-connected buttons on the board.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230613-topic-rb2_-v1-1-696cd7dbda28@linaro.org