fix up ota_from_target_files symlink detection.
fix up ota_from_target_files symlink detection.

knone1/platform_manifest,see4ri/lolili,Hybrid-Power/startsync,hagar006/platform_manifest,fallouttester/platform_manifest,pranav01/platform_manifest,ND-3500/platform_manifest,RR-msm7x30/platform_manifest