soc: qcom: cmd-db: use strncmp() instead of memcmp()

soc: qcom: cmd-db: use strncmp() instead of memcmp()

memcmp() can cause aborts on some platforms and generally seems to be
the wrong approach here. Use strncmp() instead which is more correct.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>