net: bridge: fix misspellings using codespell tool

net: bridge: fix misspellings using codespell tool

Some typos are found out by codespell tool:

$ codespell ./net/bridge/
./net/bridge/br_stp.c:604: permanant  ==> permanent
./net/bridge/br_stp.c:605: persistance  ==> persistence
./net/bridge/br.c:125: underlaying  ==> underlying
./net/bridge/br_input.c:43: modue  ==> mode
./net/bridge/br_mrp.c:828: Determin  ==> Determine
./net/bridge/br_mrp.c:848: Determin  ==> Determine
./net/bridge/br_mrp.c:897: Determin  ==> Determine

Fix typos found by codespell.

Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210108025332.52480-1-dong.menglong@zte.com.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>