ARM: dts: qcom: msm8974: add gpu support

Add support for the a3xx GPU. opp_table is chosen to include lower
frequencies common to all different msm8974 variants.

Signed-off-by: Brian Masney <masneyb@onstation.org>
[iskren.chernev@gmail.com: change after v1]
Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Link: https://lore.kernel.org/r/20210201105657.1642825-1-iskren.chernev@gmail.com


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