target/ppc: Make get_phys_page_debug handle non-page-aligned addrs

Currently our implementations of SysemuCPUOps::get_phys_page_debug and SysemuCPUOps::get_phys_page_attrs_debug are a mix of "accepts a non-page-aligned virtual address and returns the corresponding non-page-aligned physical address" and "only returns a page-aligned physical address". This is awkward for callsites, which in practice all want the physical address for an arbitrary virtual address and have to work around the possibility of getting a page-aligned address, and it doesn't account for protection being possibly on a sub-page-sized granularity. We want to standardize on the implementation having to handle non-page-aligned addresses. The ppc_xlate() function can accept a non-page-aligned input but may return a page-aligned output; we take the simple approach of ORing the page offset back into the result address after calling it. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20260417173105.1648172-8-peter.maydell@linaro.org Reviewed-by: Glenn Miles <milesg@linux.ibm.com> Message-ID: <20260430093810.2762539-9-peter.maydell@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>