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
Merge branch 'cm-11.0' into kk_mkt

Conflicts:
	tools/releasetools/ota_from_target_files

Change-Id: Ifda0aac3ebe9c3f6244e85b6f7f490c190bc6660
Revert "ota: Allow devices to skip generation of recovery-from-boot.p"

This reverts commit 651987c5f2f78207edebdd821d1700a0464fdfb5.

Conflicts:
	tools/releasetools/ota_from_target_files

Change-Id: I9a8b7298154fe8ed103a2d2c884b803d5ca99ee7