semihosting/uaccess: Remove uses of target_ulong type

semihosting/uaccess: Remove uses of target_ulong type

Replace target_ulong by vaddr or size_t types to match
cpu_memory_rw_debug() prototype in "exec/cpu-common.h":

 >  int cpu_memory_rw_debug(CPUState *cpu, vaddr addr,
 >                          void *ptr, size_t len,
 >                          bool is_write);

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250526095213.14113-2-philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250627112512.1880708-4-alex.bennee@linaro.org>