Remove unused property.

Change-Id: Iae208ef208e7949ec9aef1f1147f96fda5e47224
diff --git a/mini_common.mk b/mini_common.mk
index 6e39a09..60b36b4 100644
--- a/mini_common.mk
+++ b/mini_common.mk
@@ -72,7 +72,6 @@
 
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.carrier=unknown \
-    ro.com.android.dateformat=MM-dd-yyyy \
     ro.config.ringtone=Ring_Synth_04.ogg \
     ro.config.notification_sound=pixiedust.ogg