add add-to-product-copy-files-if-exists for pdk
add add-to-product-copy-files-if-exists for pdk

Change-Id: Ib35006824de81be31652bfff220bbe4e814869ce

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