net/hns3: support filter registers by module names

This patch support dumping registers which module name is the
`filter` string. The module names are in lower case and so is
the `filter`. Available module names are cmdq, common_pf,
common_vf, ring, tqp_intr, 32_bit_dfx, 64_bit_dfx, bios, igu_egu,
ssu, ppp, rpu, ncsi, rtc, rcb, etc.

Signed-off-by: Jie Hai <haijie1@huawei.com>
Acked-by: Chengwen Feng <fengchengwen@huawei.com>

doc/guides/nics/hns3.rst

@@ -407,6 +407,13 @@ be provided to avoid scheduling the CPU core used by DPDK application threads fo
 other tasks. Before starting the Linux OS, add the kernel isolation boot parameter.
 For example, "isolcpus=1-18 nohz_full=1-18 rcu_nocbs=1-18".
 
+Dump registers
+--------------
+HNS3 supports dumping registers values with their names, and supports filtering
+by module names. The available module names are ``bios``, ``ssu``, ``igu_egu``,
+``rpu``, ``ncsi``, ``rtc``, ``ppp``, ``rcb``, ``tqp``, ``rtc``, ``cmdq``,
+``common_pf``, ``common_vf``, ``ring``, ``tqp_intr``, ``32_bit_dfx``,
+``64_bit_dfx``.
 
 Limitations or Known issues
 ---------------------------