Remove autoconf generates files

Including the files that were automatically generated by autoconf caused
a lot of trouble in the past. This was mainly due to the fact that git
does not save timestamps of files, and then autotools thought it needs
to autoreconf. This often times failed due to different versions of
autotools being installed on the build machine vs the developer's
machine.

Let's try to solve this issue by not including any auto generated files.
Instead, let's have buildroot run autoreconf.

Change-Id: I5338ccaf19c8eb9f01a9e6c5f03f939c26a4dbfc
36 files changed