soc: qcom: fix invalid length can be configured to DCC

Invalid length can't be configured to DCC. This change
remove the design of setting length to 1 when length is 0.

Change-Id: Idcc1cfa5c38be31cad60e25182aa789d5f8bb163
Signed-off-by: Yuanfang Zhang <zhangyuanfang@codeaurora.org>