dcc_v2: fix 1 write 1 read register configuration fail issue

Re-use base address from last entry only when the decs_type of
last entry equal to "DCC_ADDR_TYPE" in dcc_config_add().

Change-Id: I6c678ddaac6c689d73b14c63d03abdbd6289dc0c
Signed-off-by: Yuanfang Zhang <zhangyuanfang@codeaurora.org>