hwc: Fix dpi values reported

HWC 1.1 expects DPI multiplied by 1000

Bug 7241591

Change-Id: I680da8769f53f8a18d942a3b292d96a16885ebfa
diff --git a/libhwcomposer/hwc_utils.h b/libhwcomposer/hwc_utils.h
index 1b1d4d6..db79e7d 100644
--- a/libhwcomposer/hwc_utils.h
+++ b/libhwcomposer/hwc_utils.h
@@ -56,8 +56,8 @@
     uint32_t vsync_period; //nanos
     uint32_t xres;
     uint32_t yres;
-    uint32_t xdpi;
-    uint32_t ydpi;
+    float xdpi;
+    float ydpi;
     int fd;
     bool isActive;
 };