Maybe you need to push directly to the /system/app folder an install from there rather than just copying to SD, since the install process would still need to copy the apk to /system/app. You have to remount as r/w in order to push to /system/app, so maybe that's what missing. I'm sure there are much more knowledgeable people to could say whether I'm way off base, just wanted to point out the difference between what I did and what you did.
Okay,
So I went ahead and just pushed Maps.apk to /system/app and it seems like it installed fine.
But I don't get a "Navigate" option after I try getting directions :/
I even checked in the About tab of Maps and it does says Platform: android:Motorola-sholes-Droid
Update: Got it to work! pushing it to /system/app doesn't work. You have to edit the packages.xml like a couple people said if you get an install error
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