hw/i386/vapic: Cope with non-page-aligned return from cpu_get_phys_page_debug()

Currently the i386 implementation of get_phys_page_debug() always returns an address aligned to a page boundary, and the vapic.c code assumes this: it adds back in the page offset after the call. Change this to OR in the page offset, so that it works whether cpu_get_phys_page_debug() returns the page address or the exact physical address. This will mean the code continues to work when we change the semantics to standardize on "return exact physical address". Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-ID: <20260430093810.2762539-2-peter.maydell@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>