dt-bindings: interconnect: Combine SDM660 bindings into RPM schema

SDM660 interconnect bindings are similar to other RPM interconnect
providers, and now it shares the same common driver with them, so
it is better to combine them into qcom,rpm.yaml.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> #db820c
Link: https://lore.kernel.org/r/20211021132329.234942-2-y.oudjana@protonmail.com


Signed-off-by: Georgi Djakov <djakov@kernel.org>