Revert "Allow devices to specify certain ro. props via TARGET_UNIFIED_DEVICE"

This reverts commit 115999f22860860ea115d0c0c628577006baeeb9.
Allow devices to specify certain ro. props via TARGET_UNIFIED_DEVICE

This modifies buildinfo.sh to not set model, name, description, and
fingerprint in build.prop. These can then be set via custom init
lib.
This also fixes ota_from_target_files to function without these
props being preset.

Change-Id: I945b2c38e60b207d2d0f82b34f4f230ac21b0657
ota: Allow devices to skip generation of recovery-from-boot.p

* Not all devices have a real recovery partition, so those devices
  should skip this generation step.

Change-Id: I4abc3f92b879e6997e4874543ec9772c3179b1d0
Build - Persistence - Add installer support [1/3]

Change-Id: I768bb30498f08b41d39db7ed887696663ba91767
Signed-off-by: Stefano Mura [STELIX] <ssspinni@gmail.com>