arm64: dts: qcom: sc7280: Add 0x81 Adreno speed bin

A642L (speedbin 0x81) uses index 4, so this commit sets the fourth bit
for A642L supported opps.

Signed-off-by: Eugene Lepshy <fekz115@gmail.com>
Signed-off-by: Danila Tikhonov <danila@jiaxyga.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20241014194825.44406-2-danila@jiaxyga.com


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