arm64: dts: qcom: sc7280: don't enable GPU on unsupported devices

arm64: dts: qcom: sc7280: don't enable GPU on unsupported devices

On SC7280 and derivative platforms GPU by default requires a signed
binary, a660_zap.mbn. Disable GPU by default and enable it only when
the binary is actually available (QCM6490-IDP, RB3gen2). ChromeOS
devices do not use TrustZone, so GPU can be enabled by default in
sc7280-chrome-common.dtsi. FairPhone5 and SHIFTphone8 DTS already
enable GPU (even though it wasn't required beforehand).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konradybcio@kernel.org>
Link: https://lore.kernel.org/r/20240907-rb3g2-fixes-v1-2-eb9da98e9f80@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>