Revert "Add hw/kelvin to top level build system."

This reverts commit e17b702537a08a7c7d196f18b68257a0a9792e47.

Reason for revert: break build (need tab indent in .mk)

Change-Id: I4ccda8d21d1ad1a465d96f929d0008a3ad941e89
2 files changed