dev: Allow additional UART interrupts to be set
dev: Allow additional UART interrupts to be set

This patch allows setting a few additional interrupts for status
changes that should never occur.

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin