bowser-common: reorganize prebuilts

Change-Id: If2313f2b080bd4ac84156ef2e9008afe19940d9a
bowser-common: add common usr/ prebuilts (from device repos)

Change-Id: I9ff6fea8c3b1f0a60d128d4e16d397a3fd1cfda2
power key changed to 116 (kernel change)

Change-Id: I1d64dcf6196e473d6967da8f27bf5a11bf37b5d1