Pinout: Add dm_exception_addr_i pin

Created by: silabs-PaulZ

The proposal is to add a dm_exception_addr_i[31:0] pin.

This will provide an address to jump to when an exception occurs when executing code during debug mode.

The reasons for this addition are as follows:

• We want to use a pin as opposed to a parameter to match how boot_addr_i and dm_halt_addr_i is implemented
• This will address the issue https://github.com/openhwgroup/cv32e40p/issues/185, where exceptions are not handled correctly during debug mode
• This solution is the same as seen on the IBEX core