Cleaning up grid size specification in Launcher

This commit eliminates the notion of in-place rotations and a bunch of
associated complexities (including the notion of canonical coordinates).
Further, the number of x and y cells per workspace screen is now being stored
in a single location in the XML definition of Workspace. This fixes a couple
bugs where incorrect values were being used. Finally, eliminated the notion of
"shortAxis" and "longAxis" in terms of padding and cell count. These have been
translated to corresponding x and y axis values.

Change-Id: I30cfed66f82d739355b3f01730b28b6c0437989c
diff --git a/res/layout-xlarge/launcher.xml b/res/layout-xlarge/launcher.xml
index fa323fd..0dd25d2 100644
--- a/res/layout-xlarge/launcher.xml
+++ b/res/layout-xlarge/launcher.xml
@@ -35,8 +35,8 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         launcher:defaultScreen="2"
-        launcher:canonicalDeviceWidth="8"
-        launcher:canonicalDeviceHeight="4">
+        launcher:cellCountX="8"
+        launcher:cellCountY="4">
 
         <include android:id="@+id/cell1" layout="@layout/workspace_screen" />
         <include android:id="@+id/cell2" layout="@layout/workspace_screen" />