Bridge port update - 16: correcting MMRP references

#Referencing bridge #MMRP #configuration entries #through #standard #bridge #port configuration in ethernet module. Corrected MMRP agent iterator routines and mapper routines to use the standard bridge port references than using a dedicated indexing. This will help in reducing the memory requirement for MMRP.

#Ethernet update 118 ...
[commit 4db22fba953b1d729d79277c413c9a52331e02c6]