remove protruding brick on LR chimney
I would not break or cut the bricks, someday you (or someone else) may want to move the TV and have a wall that is still aesthetically pleasing. Cut or chiseled bricks just won't look right. 

Use wood (or some other material) blocks to "fur" the wall out. In other words, mount the TV off of the wall the same distance that the bricks protrude.