Add empty boot image profile and preload classes for framework

The boot image profile and preloaded class files will be split
for two parts. One for art and one for framework.

These intial empty files are necessary for server side to
compare the difference.

Bug: 186455808
Test: m
Change-Id: I51a1ab6fa203a8e85e2cebeff3f64c9bfc59b58a