dt-bindings: interconnect: Add OSM L3 DT bindings

Add bindings for Operating State Manager (OSM) L3 interconnect provider
on SDM845 SoCs.

Change-Id: I9626f7824d8a84825994cc76e1856a5653ba1719
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/20200227105632.15041-3-sibis@codeaurora.org


Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Git-commit: 7a077f7fdaa4fa641c43a554db2811c62048d7f4
Git-repo: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next


[vvegivad@codeaurora.org: Separated documentation.]
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>