hw/ppc/spapr: Convert HPTE_VALID() macro as hpte_is_valid() method

hw/ppc/spapr: Convert HPTE_VALID() macro as hpte_is_valid() method

Convert HPTE_VALID() macro as hpte_is_valid() method.

sPAPR data structures including the hash page table are big-endian
regardless of current CPU endian mode, so use the big-endian LD/ST
API to access the hash PTEs.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Message-ID: <20241220213103.6314-3-philmd@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>