Temporary check in to turn off other segment features
tests when #if CONFIG_T8X8 is set as the assignment of
MBs to differnt segments in each case  will conflict.

The 8x8 code will be modified to use the new segment
feature method properly in a later check in.

Increase bits allowed for EOB end stop marker to 6 ready
for 8x8.

Change-Id: I4835bc8d3bf98e1775c3d247d778639c90b01f7f