vendor/omni: remove not working PRODUCT_PROPERTY_OVERRIDES lines

First one always wins so its useless trying to overwrite them here

Change-Id: I72f8c78f3b066384cc07670e6bbca984d31362b7
diff --git a/config/common.mk b/config/common.mk
index 1cf24e9..c158f78 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -19,12 +19,9 @@
 
 # general properties
 PRODUCT_PROPERTY_OVERRIDES += \
-    keyguard.no_require_sim=true \
     ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html \
     ro.com.android.wifi-watchlist=GoogleGuest \
     ro.setupwizard.enterprise_mode=1 \
-    ro.com.android.dateformat=MM-dd-yyyy \
-    ro.com.android.dataroaming=false \
     persist.sys.root_access=1
 
 # enable ADB authentication if not on eng build