net: dsa: Fix spelling mistakes and cleanup code

fix follow spelling misktakes:
	desconstructed ==> deconstructed
	enforcment ==> enforcement

Reported-by: Hacash Robot <hacashRobot@santino.com>
Signed-off-by: Xie Shaowen <studentxswpy@163.com>
Link: https://lore.kernel.org/r/20220730092254.3102875-1-studentxswpy@163.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>