Merge pull request #791 from powerapi-ng/fix/remove-broken-import

fix(formula): Remove broken `AbstractCpuDramFormula` import

Author: gfieni

src/powerapi/formula/__init__.py

@@ -28,5 +28,4 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 from powerapi.formula.handlers import FormulaPoisonPillMessageHandler
-from powerapi.formula.abstract_cpu_dram_formula import AbstractCpuDramFormula
 from powerapi.formula.formula_actor import FormulaActor, FormulaState