Split target/product/sdk.mk into sdk.git
Split target/product/sdk.mk into sdk.git

This changes target/product/sdk.mk so that the list of tools
and libs to build for the SDK be actually defined in both
sdk.git and development.git.

Depends on dev.git change I6bbc6644a and sdk.git change Id270eba6

Change-Id: I790df85ea8620f73c769aec0f92f474de60b63f9

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