locking/atomic: scripts: build raw_atomic_long*() directly

Now that arch_atomic*() usage is limited to the atomic headers, we no
longer have any users of arch_atomic_long_*(), and can generate
raw_atomic_long_*() directly.

Generate the raw_atomic_long_*() ops directly.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605070124.3741859-20-mark.rutland@arm.com