Move SystemUI and its permissions to /product

Since this app is frequently customized by OEMs, it doesn't
fit in the mainline /system image right now. Move it to
/product.

Bug: 110072687
Test: make
Test: boot blueline
Test: atest SystemUITests
Change-Id: If27bcccd62f239f716db5ee7f4f1418d936e1cf4