ddr_bandwidth: support multi-ports config for one channel [1/1]

ddr_bandwidth: support multi-ports config for one channel [1/1]

PD#172256

Problem:
ddr bandwidth prot config can only set 1 port for 1 channel. But
dmc controller support measure many ports on 1 channel.

Solution:
Using bit mask to support multi-ports config for one channel.

Verify:
P212

Change-Id: Iad79e6ebd6aeb74b0e31b3f1bee08de4fd557cc1
Signed-off-by: tao zeng <tao.zeng@amlogic.com>