arm64: dts: qcom: sc7280: Fix gmu unit address

When processing sc7280 device trees, I can see:

  Warning (simple_bus_reg): /soc@0/gmu@3d69000:
    simple-bus unit address format error, expected "3d6a000"

There's a clear typo in the node name. Fix it.

Fixes: 96c47197 ("arm64: dts: qcom: sc7280: Add gpu support")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220125144316.v2.1.I19f60014e9be4b9dda4d66b5d56ef3d9600b6e10@changeid