samsung/sxgbe: fix repeated words in comments

Delete the redundant word 'are'.

Signed-off-by: Jilin Yuan <yuanjilin@cdjrlc.com>
Link: https://lore.kernel.org/r/20220630124639.11420-1-yuanjilin@cdjrlc.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>