interconnect: Add support for path tags

Consumers may have use cases with different bandwidth requirements based
on the system or driver state. The consumer driver can append a specific
tag to the path and pass this information to the interconnect platform
driver to do the aggregation based on this state.

Introduce icc_set_tag() function that will allow the consumers to append
an optional tag to each path. The aggregation of these tagged paths is
platform specific.

Reviewed-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>

drivers/interconnect/qcom/sdm845.c

@@ -626,7 +626,7 @@ static void bcm_aggregate(struct qcom_icc_bcm *bcm)
 	bcm->dirty = false;
 }
 
-static int qcom_icc_aggregate(struct icc_node *node, u32 avg_bw,
+static int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
 			      u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
 {
 	size_t i;