dcc_v2: Check enable status of dcc when changing curr_list

Avoid changing curr_list when dcc is enabled. Dcc needs to be disabled
before changing the curr_list. If any link list is enabled,the enable
status of dcc will be true.

Change-Id: I571b172a85b97e3a5e4d55531fad90641283b61e
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>