app/testpmd: fix eCPRI command line style

app/testpmd: fix eCPRI command line style

In the current implementation of eCPRI flow item parsing of the CLI,
the token items in the list are not connected properly.
A command containing "rtc_ctrl rtc_id spec 14857 rtc_id mask 0xff00"
will be considered invalid. In order to support spec with mask, the
common entry needs to be typed twice and the whole command will be
too long.
By changing the token lists, it could support spec with mask without
backing from the entry of the item.

Fixes: 17d103cc9365 ("app/testpmd: add eCPRI in flow creation patterns")
Cc: stable@dpdk.org
Signed-off-by: Bing Zhao <bingz@nvidia.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>