event/dlb2: fix port COS initialization

event/dlb2: fix port COS initialization

Fix cos initialization, handling the default case too.

Substitute the semicolon for the comma
that was expected in the cos_bw command line override.
Commas are not allowed within a multi field option.
The new format is cos_bw=%d:%d:%d:%d, where the sum of
the 4 decimal values must be less than or equal to 100.

Corrected probe-time initialization order.

Fixes: bec8901bfe9f ("event/dlb2: support ldb port specific COS")
Cc: stable@dpdk.org
Signed-off-by: Timothy McDaniel <timothy.mcdaniel@intel.com>