interconnect: qcom: Fix the commit bit not getting set

Fix the BCM commit bit not getting set for TCS commands that don't wait
for completion. The current code overloads the commit/wait behavior
using the same "commit" argument to tcs_cmd_gen(), which means we'll
only commit commands that wait for completion. The commit bit needs to
be set for the last command in each VCD regardless of the wait behavior.
Add a dedicated "wait" parameter to tcs_cmd_gen() to separate this
behavior.

Change-Id: I8d577f24b07de2f37f13365c43690bae954508f4
Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>