tests: adapt storedw tests to ppgtt

MI_MEM_VIRTUAL actually means use global gtt now, not setting the bit
means use ppgtt. On previous gens, not setting the bits ment 'use
physical memory'. So what, the usual confusion.

Note that for some odd reasong this is broken on gen6, but only on the
bsd ring. Unexpected.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/drmtest.h

@@ -30,6 +30,7 @@
 #include <unistd.h>
 #include <assert.h>
 #include <errno.h>
+#include <stdbool.h>
 
 #include "xf86drm.h"
 #include "intel_batchbuffer.h"
@@ -53,6 +54,9 @@ uint64_t gem_aperture_size(int fd);
 uint64_t gem_mappable_aperture_size(void);
 int gem_madvise(int fd, uint32_t handle, int state);
 
+/* feature test helpers */
+bool gem_uses_aliasing_ppgtt(int fd);
+
 /* generally useful helpers */
 void drmtest_fork_signal_helper(void);
 void drmtest_stop_signal_helper(void);