Rest replicator registers when enabling it first time

Replicator register value could be reset when it's disabled and
clock is off. Reset the register to all ports disabled when enabling
it first time to avoid all ports to be enabled by default.

Change-Id: I29973d38eb7f836fabe22757f98db62afbe6a4c3
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>