hw/i386/vapic.c: Use cpu_translate_for_debug()

We would like to remove the cpu_get_phys_addr_debug() function, by
moving all callers to cpu_translate_for_debug(). Update the callsites
in vapic.c.

In the process we can drop the old "OR the page offset back in"
workaround that we had for when cpu_get_phys_page_addr() returned
the physaddr of the page base rather than the exact physaddr of
the input virtual address.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20260430093810.2762539-20-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>