soc: qcom: smd-rpm: Add SM6115 compatible

Add a compatible for SM6115

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Link: https://lore.kernel.org/r/20210731164827.2756798-3-iskren.chernev@gmail.com


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