target/cpu: Do not include 'exec/cpu-defs.h' anymore

target/cpu: Do not include 'exec/cpu-defs.h' anymore

Nothing in all our target "cpu.h" directly uses definitions
from "exec/cpu-defs.h": no need to include it there. This
remove a lot of target-specificities, simplifying inclusion
of target "cpu.h" by common code.

Inspired-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20260313062055.2188-20-philmd@linaro.org>