s390/atomic: mark all functions __always_inline

Atomic functions are quite ubiquitous and may be called by noinstr
ones, introducing unwanted instrumentation. They are very small, so
there are no significant downsides to force-inlining them.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20240320230007.4782-2-iii@linux.ibm.com


Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>