Revert "ipv6: sr: switch to GFP_ATOMIC flag to allocate memory during seg6local LWT setup"

The previous patch fixed the same issue mentioned in
commit 14a0087e ("ipv6: sr: switch to GFP_ATOMIC
flag to allocate memory during seg6local LWT setup").

Let's revert it.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Link: https://patch.msgid.link/20250516022759.44392-5-kuniyu@amazon.com


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