8016586: PPC64 (part 3): basic changes for PPC64

Added #includes needed for ppc64 port. Renamed _MODEL_ppc to _MODEL_ppc_32 and renamed corresponding old _ppc files to _ppc_32.

Reviewed-by: dholmes, kvn

hotspot/src/share/vm/runtime/vm_version.cpp

@@ -187,6 +187,7 @@ const char* Abstract_VM_Version::jre_release_version() {
                  AMD64_ONLY("amd64")             \
                  ARM_ONLY("arm")                 \
                  PPC32_ONLY("ppc")               \
+                 PPC64_ONLY("ppc64")             \
                  SPARC_ONLY("sparc")
 #endif // ZERO