arm64: dts: qcom: sdm845: Rename gic-its node to msi-controller

This is just like commit ac00546a ("arm64: dts: qcom: sc7180:
Rename gic-its node to msi-controller") but for sdm845.  This fixes
all arm64/qcom device trees that I could find.

Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20191216222021.1.I684f124a05a1c3f0b113c8d06d5f9da5d69b801e@changeid


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