arm64: dts: qcom: sc7280: Add SPMI PMIC arbiter device for SC7280

Add SPMI PMIC arbiter device to communicate with PMICs
attached to SPMI bus.

Signed-off-by: satya priya <skakit@codeaurora.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Link: https://lore.kernel.org/r/1615461961-17716-13-git-send-email-rnayak@codeaurora.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>