interconnect: qcom: Simplify the vcd compare function

Let's simplify the cmp_vcd() function and replace the conditionals
with just a single statement, which also improves readability.

Reviewed-by: Mike Tipton <mdtipton@codeaurora.org>
Link: https://lore.kernel.org/r/20201013171923.7351-1-georgi.djakov@linaro.org


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