Revert "wifi: wilc1000: set atomic flag on kmemdup in srcu critical section"

This reverts commit 35aee01f

Commit 35aee01f ("wifi: wilc1000: set atomic flag on kmemdup in srcu
critical section") was preparatory to the SRCU to RCU conversion done by
commit f236464f ("wifi: wilc1000: convert list management to RCU").
This conversion brought issues and so has been reverted, so the atomic flag
is not needed anymore.

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240528-wilc_revert_srcu_to_rcu-v1-2-bce096e0798c@bootlin.com