drm/msm: Fix spelling mistake "Purgable" -> "Purgeable"

There is a spelling mistake in debugfs gem stats. Fix it. Also
re-align output to cater for the extra 1 character.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210406133939.425987-1-colin.king@canonical.comSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_gem.c

@@ -983,7 +983,7 @@ void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
 			stats.all.count, stats.all.size);
 	seq_printf(m, "Active:    %4d objects, %9zu bytes\n",
 			stats.active.count, stats.active.size);
-	seq_printf(m, "Purgable: %4d objects, %9zu bytes\n",
+	seq_printf(m, "Purgeable: %4d objects, %9zu bytes\n",
 			stats.purgable.count, stats.purgable.size);
 	seq_printf(m, "Purged:    %4d objects, %9zu bytes\n",
 			stats.purged.count, stats.purged.size);