Allow DISABLE_ALL_APPS to be set using a system property.

 - Moving the property to LauncherAppState
 - The property is only read on dogfood builds.

The property can be set using setprop or /data/local.prop

Change-Id: I14c7354efb12edb93f97e81687a6f920cc634e9a
diff --git a/src/com/android/launcher3/DeviceProfile.java b/src/com/android/launcher3/DeviceProfile.java
index 67b0933..a236b84 100644
--- a/src/com/android/launcher3/DeviceProfile.java
+++ b/src/com/android/launcher3/DeviceProfile.java
@@ -126,7 +126,7 @@
     DeviceProfile(String n, float w, float h, float r, float c,
                   float is, float its, float hs, float his) {
         // Ensure that we have an odd number of hotseat items (since we need to place all apps)
-        if (!AppsCustomizePagedView.DISABLE_ALL_APPS && hs % 2 == 0) {
+        if (!LauncherAppState.isDisableAllApps() && hs % 2 == 0) {
             throw new RuntimeException("All Device Profiles must have an odd number of hotseat spaces");
         }