qtest: Fix rtas dependencies

qtest "rtas" command is only available with pseries not all ppc64 targets,
so if I try to compile only powernv machine, the build fails with:

  /usr/bin/ld: qtest.o: in function `qtest_process_command':
  .../qtest.c:645: undefined reference to `qtest_rtas_call'

We fix this by enabling rtas command only with pseries machine.

Fixes: eeddd59f ("tests: add RTAS command in the protocol")
Signed-off-by: NLaurent Vivier <lvivier@redhat.com>
Message-Id: <20200205232016.588202-2-lvivier@redhat.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

qtest.c

@@ -27,7 +27,8 @@
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "qemu/cutils.h"
-#ifdef TARGET_PPC64
+#include "config-devices.h"
+#ifdef CONFIG_PSERIES
 #include "hw/ppc/spapr_rtas.h"
 #endif
 
@@ -628,7 +629,7 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
 #else
         qtest_sendf(chr, "OK little\n");
 #endif
-#ifdef TARGET_PPC64
+#ifdef CONFIG_PSERIES
     } else if (strcmp(words[0], "rtas") == 0) {
         uint64_t res, args, ret;
         unsigned long nargs, nret;