accel/tcg: Correct list of included headers in tcg-stub.c

accel/tcg: Correct list of included headers in tcg-stub.c

In commit 3549118b498 we moved cpu_loop_exit*() declarations to
"exec/cpu-common.h" but neglected to update tcg-stub.c. We missed
it because "exec/cpu-common.h" is indirectly pulled in via
"exec/exec-all.h" -> "exec/translation-block.h". Include it
directly instead of the not necessary "exec/exec-all.h".

Commit bb6cf6f0168 ("accel/tcg: Factor tcg_cpu_reset_hold() out")
removed the need for "exec/tb-flush.h", so remote it too.

Fixes: 3549118b498 ("exec: Move cpu_loop_foo() functions to 'cpu-common.h'")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Message-Id: <20250424094653.35932-4-philmd@linaro.org>