firmware: qcom_scm: Add msm8994 compatible

This change adds a compatible for msm8994,
which requires no additional clocks for
scm to probe correctly.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Konrad Dybcio <konradybcio@gmail.com>
Link: https://lore.kernel.org/r/20200624150107.76234-2-konradybcio@gmail.com


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