target-arm: Pass mmu_idx to get_phys_addr()

target-arm: Pass mmu_idx to get_phys_addr()

Make all the callers of get_phys_addr() pass it the correct
mmu_idx rather than just a simple "is_user" flag. This includes
properly decoding the AT/ATS system instructions; we include the
logic for handling all the opc1/opc2 cases because we'll need
them later for supporting EL2/EL3, even if we don't have the
regdef stanzas yet.

Signed-off-by: Peter Maydell <[email protected]>
Reviewed-by: Greg Bellows <[email protected]>
Reviewed-by: Edgar E. Iglesias <[email protected]>