net: hns3: add new function hclge_tm_schd_mode_tc_base_cfg()

This patch encapsulates the process code of tc based schedule mode of
function hclge_tm_lvl34_schd_mode_cfg() into a new function
hclge_tm_schd_mode_tc_base_cfg(). It make code more concise and the new
process code can be reused.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>