qemu-system-ppc64 allow endian selection

target/config/Config.in.endian

@@ -23,6 +23,7 @@ depends on ADK_TARGET_SYSTEM_GENERIC_ARC \
 	|| ADK_TARGET_SYSTEM_QEMU_MICROBLAZE_S3ADSP1800 \
 	|| ADK_TARGET_SYSTEM_QEMU_MIPS \
 	|| ADK_TARGET_SYSTEM_QEMU_MIPS64 \
+	|| ADK_TARGET_SYSTEM_QEMU_PPC64 \
 	|| ADK_TARGET_SYSTEM_QEMU_SH \
 	|| ADK_TARGET_SYSTEM_QEMU_XTENSA