Simulate a small delay on GC Memcard operations

This was not needed for most games before because the external exception was
itself delayed. aram-dma-fixes changed that and made the external exception
happen a lot quicker, breaking games that relied on the memcard operations
delay.

Fixes issue 5583.
Merge branch 'aram-dma-fixes' into FIFO-BP

# By Pierre Bourdon
# Via Pierre Bourdon
* aram-dma-fixes:
  Simulate a small delay on GC Memcard operations
Merge aram-dma-fixes (r76a13604ef49b522281af75675f044d59a74e871)
Delayed the interrupts in the EXI Channel.

Fixes issue 5580.