Removed exception checking in IF stage

Created by: silabs-oysteink

Sequenced instructions and table jumps will proceed to ID stage regardless of MPU status and bus error. Using deassert_we logic in ID stage to avoid side effects.

Added abort_op bits to all stages. These gets set whenever a known exception or trigger match is active in the stage where they occur.

Keeping ZC_EXT localparam as 0 until verification is ready to enable it.

NOT SEC clean as the difference in deassertion logic impacts the prefetcher.