Remove _call_sram_irqs from avr_core_watch_read()

This was introduced as a workaround to catch IO register updates from hardware for the new
sram tracing facility but gatk55 suggested #540 to rather modify peripherals instead.

This commit fixes the adc by using calls to avr_core_watch_write intead of direct update
of avr->data[] in avr_adc_int_raise().

Author: jpcornil-git

simavr/sim/avr_adc.c

@@ -36,12 +36,11 @@ avr_adc_int_raise(
 		avr_regbit_clear(avr, p->adsc);
 		if( p->adts_mode == avr_adts_free_running )
 			avr_raise_irq(p->io.irq + ADC_IRQ_IN_TRIGGER, 1);
-                if (!p->read_status) {
-                    /* Update I/O registers. */
-
-                    avr->data[p->r_adcl] = p->result & 0xff;
-                    avr->data[p->r_adch] = p->result >> 8;
-                }
+		if (!p->read_status) {
+			/* Update I/O registers. */
+			avr_core_watch_write(avr, p->r_adcl, p->result & 0xff);
+			avr_core_watch_write(avr, p->r_adch, p->result >> 8);
+		}
 	}
 	return 0;
 }

simavr/sim/sim_core.c

@@ -262,7 +262,6 @@ uint8_t avr_core_watch_read(avr_t *avr, uint16_t addr)
 	}
 
 //	_call_register_irqs(avr, addr);
-	_call_sram_irqs(avr, addr); // Catch update from io read callback
 	return avr->data[addr];
 }