[FIX] Fix AXI openMAC C_S_AXI_MIN_SIZE configuration

This fix solves wrong address decoder configuration used in the ipif core
for sub memory maps.

Change-Id: I28ec99c95d073be1cf889b67b58304fbb68984b9
[TASK] Remove test port in axi_openmac IP-Core

Change-Id: Ief4afa8047cc312e04e82b3135c7505ef324097b