qemu/atomic128: Include missing 'qemu/atomic.h' header

qemu/atomic128: Include missing 'qemu/atomic.h' header

qatomic_cmpxchg__nocheck() is declared in "qemu/atomic.h".
Include it in order to avoid when refactoring unrelated headers:

    In file included from ../../accel/tcg/tcg-runtime-gvec.c:22:
    In file included from include/exec/helper-proto-common.h:10:
    In file included from include/qemu/atomic128.h:61:
    host/include/generic/host/atomic128-cas.h.inc:23:11: error: call to undeclared function 'qatomic_cmpxchg__nocheck'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
       23 |     r.i = qatomic_cmpxchg__nocheck(ptr_align, c.i, n.i);
          |           ^
    1 error generated.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20241212141018.59428-4-philmd@linaro.org>