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Doing mmm cts/tests/tests/hardware woudn't work, because make
didn't have BUILD_CTS_PACKAGE defined. Thus, move these core
CTS rules to a separate file called cts/build/config.mk, so it
can be included in the core build system. Finally, move the
other CTS build rule files into the build directory for
consistency as well.

This should make everybody happy I think...

Change-Id: I0792d0ba957ae31f79be0acbc9de8fc78e9374dc