proprietary-files: Organize by usage

Change-Id: Ica0f6c89b22b185293db802fbca28f23eb37c534
proprietary-files: Update for KXA21.12-L1.21 4.4.3 release

Change-Id: I2f2545126c141e1f4615f2cee3cb90bf5d05ac8b
root: Updates from 4.4.3/caf

Change-Id: I64041dc1aca586a617929d38db384c368f02028b
Update 4.4.3 dt.img

Change-Id: I84726e47e395809ad1713e901f5cae0d65311c5e