fix(Boards): Add GPIO2_IRQ_Handler for MAX78000 FTHR_RevA #1221
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Description
One of the customers reported that they can't use P2.3 pin on MAX78000 FTHR even they enable interrupt and configure callback function. Interrupt is not triggered, and callback function is not called.
I figured out that GPIO2_IRQ_Handler was not defined even as a weak function in board.c file. I thought it might be better to have a weak definition for GPIO2 interrupts as well. So, users can also override this function in their application if needed.