wifi: mwl8k: use time_after to replace "jiffies > a"

time_after deals with timer wrapping correctly.

Signed-off-by: Li Qiong <liqiong@nfschina.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220606135449.23256-1-liqiong@nfschina.com
Link: https://lore.kernel.org/r/20220618131305.13101-1-wangxiang@cdjrlc.com
Link: https://lore.kernel.org/r/20220715050016.24164-1-wangborong@cdjrlc.com