Update software to match efinix hw

sw/bootloader/irq.c

@@ -5,20 +5,7 @@
 #include "devices/interrupt.h"
 #include "devices/uart.h"
 
-char lastchar;
 
 
 void handle_irq() {
-    uint8_t status;
-
-    status = irq_get_status();
-
-    if (status & BUTTON) {
-        cputs("Button Interrupt!\n");
-        irq_set_status(status & ~BUTTON);
-    }
-    if (status & UART) {
-        lastchar = uart_rxb();
-        irq_set_status(status & ~UART);
-    }
 }