arm64: dts: qcom: sc7280: Add 0xac Adreno speed bin

A643 (A635 speedbin 0xac) tops out at 812 MHz. Fill in the
opp-supported-hw appropriately.

Note that fuseval 0xac is referred to as speedbin 1 downstream, but
that was already in use upstream, so 2 was chosen instead.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230926-topic-a643-v2-4-06fa3d899c0a@linaro.org


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