add missing comma
add missing comma

A missing comma is breaking the option parsing for the signing tools
(this doesn't affect any device code, only the signing tools).

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